It's not like they're going to stop the main series games. There's too much tied to them for them to stop making them, this is just another side-project that has the potential to be good, but is currently for me a very much wait-and-see prospect. I hope it's awesome though.
Re: Steve Rogers dying in Infinity War, I've read he is only contracted for two more movies. I'm expecting him to die at the end of Civil War as a nod to the comics, and come back somehow for the final battle in Infinity War II.
Because come on, if anything is going to ressurect someone without any question, it's a magical gauntlet with the ability to rewrite reality.