If the economic pressure is relieved by people leaving (or never entering) the economic system, then I think this would result in a decline (or a levelling out) of Bitcoin's market cap.
So again, if the "economic pressure from deadweight loss gets relieved somehow" theory is true, then not only does it mean that we can't use the protocol to artificially increase fees, but it also means that any attempt to do so will instead have either no effect (the code will fork around it) or a negative effect (growth within the Bitcoin economy will stall or reverse [rather than fees increasing]).
Food for thought!
Oh, that one is simple!
The PoW nature of systems in question must prevent their uncontrolled duplication, so there will be only a few worth considering switching to. Plus the network effects of money in general will preserve the economic pressure from leaving the strongest networks in the field (which is again defined by manageable costs of running a full validator from home networks without permission).
And other security models aren't real honey badgers to be of any interest to many.
I'm not sure I'm following. Are you saying that the path of least resistance is to fork the protocol to raise the block size limit? Or that you think the system can permanently exist in a state where Qmax is to the left of Q* (economic pressure to create a fork exists yet the fork never happens)?