I know this is an older thread, but just wanted to chime in that from experience, you won't be able to isolate as much as you think running fibre to the outdoor switch because the power to the PoE switch is still connected to your house's panel and a lightning strike will easily travel back through that to your home and hit you panel and thus anything connected to the panel (yes, technically it should go to ground there, but it is such a high amount of surge that it still flow out to other devices and get to other grounds through them as well due to the enormity of the surge).
The only way to attempt to alleviate it would be to have a lightning strike rod and grounding system on your home/property and even that will only mitigate things.
Don't get me wrong, running fibre is still the right thing to do, as at least the surge is then not going directly into your other network gear and directly to your computers and other expensive electronics, possibly putting a little distance between them and where the surge will be coming from (and with extremely good surge protection, you might be able to mitigate some of it by having those devices ahead of your expensive electronics take the bulk of the hit/burn out and possibly break the connection the other devices). But don't really count of it if you suffer a direct hit, as nothing short of the lightning rods and grounding system can handle that kind of load in standard construction homes.