I would disagree here. The biggest server OEMs and hyperscalers get their DDR5 without any scalper middlemen, that may plague consumer market.
And it will be just a question of quantities and Milan vs. Genoa breakdown.
Granted, these are different process nodes, but if AMD has a surplus (slow uptake) in one area, it can shift wafers to another area, with insatiable demand - GPUs. Once N31 and N32 are production worthy, AMD can make more of those, since they use different memory...
There is a huge installed base of Intel CPUs users, who were holding out so long for a worthwhile upgrade that they were almost ready to switch to AMD. And AMD gave them a reason (excuse) to stay with Intel - without feeling like an idiot.
AMD has followed a wise strategy of staying in every market they have long term desire to grow in, despite the fact that there are silicon shortages, despite the fact that there is an opportunity cost for staying in market segments (GPUs, consloes for example) that may be le less profitable today than other ones.
In light of that, the retreat from high end of the desktop segment is not outright destruction of one part of AMD's TAM, but it makes is it highly uphill battle to realize more market share in desktop. Full year wasted, until Raphael, Zen 4 is released a year from now.
TLDR of that is AMD could have had a point from a tie in gaming, with Zen3d.
But by postponing the release of Zen 3D, the complete focus of this year's big hardware review season is a big fat L for AMD. And AMD will not recover from the loss by announcing Zen3d desktop when no one is paying attention. It will be a year until we have a similar attention to CPUs with Zen 4 generation release vs. Raptor Lake from Intel.
Another way to look at it, AMD could have still been in gaming leadership with Zen3D (by getting a tie in the reviews) with just a single stack of L3. By early next year, that single stack of L3 may be a yawn. And at this time, AMD / TSMC may not have a solution for the challenge of > 1 layer of V-Cache yet.
If your original point stands that DDR5 will be a problem throughout 2022, and it slows Zen 4 adoption, AMD could benefit from yet another bump to Zen 3 generation, by giving it another upgrade with multiple levels of V-Cache in H2 2022.
But, it is not like the competition is going to be running away, due to DDR5. Sapphire Rapids is DDR5 only, so DDR5 shortage would affect it as much as it would affect Genoa.