You're NOT going to move to 2.5G automatically because even if you build a new computer with 2.5G integrated
Soon there won't be no "even if". 2.5GbE will (likely) be available on every new PC. That's what I meant.
you will not change the Switch unless you are actually wanting to buy a new one and pay the price premium for a faster 2.5G one compared to all the 1G gear that is already in the market.
Assuming you use a switch at all, yes - you'll have to replace it. So for people who have one, that's an extra cost - still way smaller than going 10GbE.
And you still have to add NICs to the older computers. That is the CURRENT cost to implement 2.5G.
I precisely used the word: gradually.
Yes, if you want 2.5GbE tomorrow, on every PC - it's an extra cost.
But that's not what this is about. We're talking about 2.5GbE becoming a new mainstream standard. So that 2, 3 or 5 years from now (hard to say how long) every new mainstream device - for both home and office - comes with a 2.5GbE in place of 1GbE that it used to come.
I'm not sure if you remember how we moved from 100Mbps to 1Gbps in early 2000s. The standard was finalized in 1999, but even as late as 2006 1GbE was a "premium" feature that you didn't get on some cheaper PCs.
And yeah, 10GbE NICs appeared in 2003 (twisted pair 10GBASE-T in 2006). Hardly anyone cared.
The fact that today:
- we're relying more on integrated NICs
- new standard uses the same cables
already mean the transition should be much faster.
So in my household example: I have a few PCs and all of them should be replaced by 2022 (with Tiger Lake or later). So all my PCs will be 2.5GbE-compliant.
I'm more worried about the ISP-provided router, which means I may be forced to buy a 2.5GbE or 5GbE switch - they'll hopefully cost $30 by then.
Other than that - absolutely no extra cost.
Yet, when the vendors decides to introduce 5G in two or three years, you will have to purchase new computers/Switches/NICs AGAIN, and maybe cables.
I won't *have* to purchase anything. It'll be just as above. 5GbE-ready devices will launch and after another replacement cycle I'll be on 5GbE. And with the distances I have at home, CAT5e will still work.
If I wanted to get 2.5 or 5GbE as soon as possible - sure, there's an extra cost (still smaller than 10GbE). But I don't. I'm perfectly happy getting 2.5GbE in e.g. 2023 and 5GbE in 2028 or something - INSTEAD OF STAYING ON 1GbE.
And we're still not using 14 years old 10G, yet, which you will eventually have to buy AGAIN, with mandatory cabling.
10GBASE-T is expensive and there's a good chance it'll never be a mainstream solution. It was introduced pretty much together with 1GbE - as an enterprise-grade solution for connecting servers and workstations.
Especially today, as 5GbE becomes possible over standard CAT5e, going over all the necessary fuss for 10GbE looks even less worthwhile.
Also, we now move to PCIe 4.0 and USB 4.0, which will make 40GbE possible, but that's already Cat8 cabling.
So if someone is on 1GbE today, he can benefit from 2.5 and 5GbE - to move directly to 40GbE at some point.
And USB 4.0 / 40GbE is an important milestone because it'll lead to modular systems.
2.5, 5, 10 gigabit ethernet - functionally that's just faster transfers, so not everyone feels the urge.
And of course I really hope to see stable 1Gbps over WiFi 7 (802.11be) by 2024 at which point the only ethernet cable I'll need is the one going to the NAS.
As I have stated before, since 2017, Zen introduced 4 built-in 10G MACs that supports 10GBASE-KR. Sadly, AMD decided to not expose it in any of their products but the EPYC Embedded line.
Because it only makes sense in EPYC embedded. For the same reason Intel only does it in Xeon D.
Then you need a pair of 20-30 U$D fiber transceivers, fiber cabling, which is cheaper than CAT6A cabling, plus a Mikrotik Switch like the 149 U$D
CRS305-1G-4S+IN or the 269 U$D
CRS309-1G-8S+IN, and voila, you have the baseline for a rather high end network that you will never have to touch again until you become bald or your hair turns gray. Sounds like a good investment to me. Is simply that some vendors didn't wanted to offer such products to consumers.
No offense, but you're talking about it as an enthusiast. So you want the fastest ethernet... because it's the fastest ethernet. I'm talking about a common mainstream standard.
Also, the suggestion of running fibre at home... Was it supposed to be a joke?

Fibre can't be bent as much as twisted pair, so you can't put them in existing conduit.
So now I'm either running cables on the floor (lovely!) or doing a home renovation. So I really doubt it's cheaper than Cat 6.
Realistically, they don't seem too expensive to me considering how many years they will last.
That is a total guess.
We may end up with a different 10GbE standard since this one is already old and wasn't created with consumer equipment in mind.
As such, the first standard that I may be inclined to really invest into is 40GbE - and that's only if modular computers follow (i.e. a serious functional gain). If it's just for file transfers, I'll be perfectly fine on 5GbE. Probably for the rest of my life. That's 600MB/s. SATA SSD speed.