Doesn't most of the long-haul already go through T2?
U2 is still near the beginning of their "exclusive" contract with LPL; it's known that they wanted MAN ops to begin with but having made it's bed with BA, MAN is now lumbered without them for a good number of years unless U2 decides to tear up it's contract with LPL.
FR's problem is that they have 189 seats to fill on their aircraft. We have seen that they are trying out various routes out of LPL but have had to scale back and eventually withdraw some of them because the aircraft is too large to support those routes. Plus if we're talking up their expansion here, remember they only fly to Dublin and Shannon...and there are plenty of folk who visit those environs each year. If they had one or two non-Irish routes ex-MAN and were expanding those with no impact on LPL, then we might have cause for more optimism.