Seeing as AA! has had two consecutive albums debut in the Top 40, and continue to sell out tours, I'd say they'd do just fine without a label. FTSK had some success with 'Woah!', followed that up with a complete pile of shit EP and lost their fanbase.
They were more popular than you're giving them credit for.
I see a similar future for a trend-infused band like this. But I'd definitely milk that shit if I was in their shoes too. Take the money you made from the last album, quickly record, release it and profit. Looks like what they're doing.