If you install in-wall cat6 it’ll probably be obsolete by the end of the decade. No. Most devices will still work just fine on Cat 5e for another 10-20 years,

If you install in-wall cat6 it’ll probably be obsolete by the end of the decade. No. Most devices will still work just fine on Cat 5e for another 10-20 years, running at 1gbps. Cat 6a, running at 10gbps, will be fine for residential for another 25-30 years. Putting fiber in the walls is an expensive overkill. If you are worried about future proofing, just install conduit with cat 6a.