I worked on the hardware for the first ever 4K drives five years ago which are just now becoming mainstream. The Amiga will never be affected because the write burst rate even with RMW is way in excess of Amiga IDE capability.
Remember that all planned current generation 4K physical drives have 512Byte logical support. (i.e. they work just like the old ones)
Drives without 512Kbyte logical emulation are at least another 5 years away.
