From my (non-tech, pleb) perspective, leaving the protocol alone seems like a very very good idea.

The energy and innovation on layer 2 (and 3?) protocols can hopefully address any improvements we need now and give us tools for difficulties as they arise.

In the short time that I've known about bitcoin, it's become a source of real hope for me. When I hear someone casually mention changing the base layer protocol, I feel queasy.