Boeing is certainly far from essential to anyone except the United States. The US does not actually own the planet and Britain seems to gain more by Bombardier's survival than it does by Boeing (which is the case for most countries except the USA).  What would be good would be for every country on the planet to start severing trade ties with Boeing (and all US companies) given the US is busily trying to make it impossible for anyone to trade with the US.  All developed nations should be aiming to exclude the US from trade, given the protectionist attitudes of Trump's administration.