Unpopular opinion, Bitcoin blocks should be much smaller and slower, and support a 2WP to a single merge mined sidechain where blocks can be as fast and large as miners vote for (Rootstock proves that...
You basically get two tier security;
1. Idle security on L1 where your coins are safe no matter what because you downloaded all the history.
2. Live security; where you (or someone you trust) have to have been online at least once in the past few weeks to challenge any invalid checkpoint attempt
This second tier is what all use cases need, except massive massive savings by someone who can't run or trust anyone to run a watchtower for him.
So I would argue most money will move to the sidechain including most savings and L1 will be mostly to act as a clock, and possibly as a bridge between multiple sidechains.
1. Idle security on L1 where your coins are safe no matter what because you downloaded all the history.
2. Live security; where you (or someone you trust) have to have been online at least once in the past few weeks to challenge any invalid checkpoint attempt
This second tier is what all use cases need, except massive massive savings by someone who can't run or trust anyone to run a watchtower for him.
So I would argue most money will move to the sidechain including most savings and L1 will be mostly to act as a clock, and possibly as a bridge between multiple sidechains.