I suspect they would have lasted longer - but I’m not sure they had the financial backing to really make it work.
ok, had everything run perfectly then I reckon they would have made it, but anyone one of a multitude of problems arising would have had the same result.
they didn’t seem to have much in the contingency pot.
i still think efficient narrow body twin jet ops probably is the future for routes like U.K.>East coast US but whether that is with legacy airlines adjusting or new players remains to be seen. Though for new players the record isn’t great