I sincerely doubt Capcom will be dropping the game anytime soon. Like SFV, I expect the initial sales to be a bit mediocre but for it to have long legs. It's been built from the ground up with a 'games as a service' model which means they can usually offset disappointing initial sales with dlc to make it profitable in the long term.
That could happen. I could see MvCI doing worse than SFV because SFV didn't have all this bad word-of-mouth going into launch. That happened a few days later.