No some of us will use the same board for later generation CPU's, back in 2006 I bought an M2N-SLI Deluxe, when Phenom arrived I replaced my X2 3800 with an x4 9650, and then later bought an x3 720BE then an X4 965 all for that board. And that was an AM2 board running a Phenom II. So yes upgradeability works, why do you need a new platform for a cpu upgrade, a new platform only makes sense if your upgrading things that rely on it.
I use x58 now and honestly my SATA SSD just fine with SATA II, I don't have a need to replace my 240 Samsung 840 Evo for an M.2, my hard drives for mass storage are all 5400RPM so honestly SATA 1.5 would take care of them without an issue, PCIe 2 doesn't bottleneck my GTX 950 or even a GTX 980 Ti i had but was overkill for my use. So it really comes down to you only need to upgrade your platform if your upgrading something else as well that needs the new platform. So good on AMD and shame on Intel.