I like the idea of being able to opt out of the advanced economics model.
However, I'm not sure I like your idea:
I feel airlines that do not participate shouldn't be penalized with a lower multiplier. Those that do should be rewarded with perhaps a higher multiplier,Again these 'Advanced economics' features should be something you can turn off, what the downsides of turning it I am still thinking about, the top idea's I have are reducing the VA's maximum multiplier by a step and maybe simplifying the formula for figuring out available passengers when booking a flight.
Just my thoughts,