Ant-Man won't flop if it's anything from just decent to above. It may be the lowest grossing MCU film since the solo Phase 1 films, but it'll be solid. For the record, I think it'll outperform Thor and TFA by a decent amount.
I think it'll pull in a minimum of $500 million, if only for the Avengers ties (the banner that gave us the first official glimpse of Yellowjacket also had an Avengers Initiative logo. It'll tie-in one way or another). A good Ant-Man tease in AoU or a Civil War tease at the end of Ant-Man would draw some butts to the seats, too, and one or the other (both?) will happen.
