I cant see them lasting long, maybe a couple of albums or so. I dont know the exact details (im just going by what ive been told/read), but if a few little fall outs like hayley and josh splitting or whatever the hell happened nearly caused them to split, compared to other bands who have breezed through far worse situations, I cant see them surviving anything much worse. And just generaly the state the music industry is in now, also I dont think the kind of music they play has the longevity as other bands.
But hey, i could be wrong.