The DNC is never gonna put Bernie (and probably not AOC) on their presidential ticket. They will however use him (her) to try to drive voters pissed at the status quo into their "we're an opposition party" trap. They'll parade them around to get folks on board, let them run primary campaigns that they will concede and endorse an establishment goon. The Democratic socialist of America are a facade of leftist ideals used to co-opt folks into the Democratic party.