I'm expecting that this would require explicit support by the manufacturers. At the very least from the device manufacturers if not by the chip manufacturers.
The question is if this would help enough to matter.
There are two areas I see it potentially helping:
1. longer lifetime due to reduced wear by not having to copy the blocks as much
2. better performance by being able to update the blocks and therefor avoid the need to do as many slow erase cycles (the device tries to do these in the background, but if there are enough writes on a full enough device, it has to wait for them)