Where if it was so great an idea it would already be in existence.

I'm optimistic there is low-hanging fruit in this area if Hanson's near/far interpretation is correct. Maybe evolution engineered us for hypocrisy by making mental pathways that let the two modes collaborate hard to stumble upon.

I'd guess that many existing popular self-improvement techniques help the two modes work together more effectively somehow or another.

Anyway, you could always zoom in and understand the impact of switching costs through experimentation ;)