To me, fedimint is a set of tradeoffs. Notably, it's trusted in that the end user no longer directly holds bitcoin keys. It's also potentially a much more private way to transact with bitcoin.

Fedimint seems like the closest thing to a proper scaling solution we have within reach today. Ten or twenty years from now, the average person will not be interacting directly with the bitcoin blockchain - at least not with any frequency. Having hundreds of what are effectively side-chains that are all interoperable via lightning could offer orders of magnitude greater efficiency and access to the bitcoin network.

I think people will end up using it just like a regular wallet. The federations could be established by local bitcoin circular economies, enabling them to onboard and scale in an efficient manner. It could also be used similarly to liquid - more institutional and global in scope. Each federation will likely have a slightly different niche. Hopefully a "gmail" doesn't emerge and dominate all the traffic.