Fixed-term Parliaments Bill

Just to be topical, what would happen in a situation such as exists in Ireland at the moment, where there is a weak Government, a coalition breaks up, there is a financial crisis and it is clearly essential that the Government renew themselves with an early general election? What would happen in such circumstances if the Bill goes through as drafted? Would we have the absurd situation that two thirds of Members would have to vote to kill off a Parliament that nobody wanted to survive any longer?