I agree some of your points are reasonable and as a short term solution, maybe for domestics as well, the lower trip costs of an EMB vs 320 or 737 could be useful. However problem one is that I don’t think BA care enough about LGW to come up with an innovative solution (would love to be proved wrong) and problem two is that if you build up a route on an EMB to a level where it’s profitable, a RYR or an EZY or even these days a WIZ fancies having a go at it and there is a maxim to the effect that in a competitive situation, eventually the lower/lowest cost provider will always win.