Yeah, having been called an idiot/troll/shill by the "1 MB is sacred" crowd for months did spoil my academic detachment, I confess.
So did you pick a consensus side in matters which have no impact upon you merely out of academic interest or because of a bitter emotional reaction?
So why would the miners give discounts for transactions in the SW format?
Ignoring the miners long term incentives to benefit the ecosystem and assuming short term selfish behavior only, the miners will be incentivized by more tx fees when the capacity more than doubles. When margins are extremely tight these incentives are more than enough to encourage the right behavior.