In terms of having any players, I don't think MCSG will die for at least another year or so. However, the community and the game have already died to me and many others already. I rarely see anyone I recognize from 2012/2013 anymore and slowly but surely the game is completely changing, probably for the worse. Old, big maps are slowly being weeded out and being replaced with small, new maps that don't require much strategy and all look really generic. Old YouTubers are gone and new ones are in. Everything just feels different around here. In general the community used to have more of a positive attitude, and I most definitely can't say that now.
So basically, MCSG isn't dead, but at the same time it is dead.