I know this is probably tongue in cheek, but I genuinely thought the same until recently. There's a company called Helion which is developing a really cool fusion process that doesn't use steam as an energy transfer mechanism. Obviously it has its own set of drawbacks and roadblocks, but still really cool tech in the making.
Here's the video I saw going into detail on it if anyone's interested:
I'll miss my cozy little Lemmy...
The upsides are apparent for the platform, but there's no denying that change will be inevitable for all of us, whether some instances choose to defederate or not.