Genesis blocks don't generally "move" but ideas are certainly being thrown around. Usually, replays are never noticed by the community because they are not done all at the same time due to a critical bug. In this case, it impacted everyone so all nodes had to be replayed.

There's also the idea to consider that computers are getting faster and cheaper. In two years there may be other hardware level solutions which speed up the process.

It's certainly something we'll have to get serious about in the future.