The Yanks biggest problem is stadia infrastructure.The main stadiums are geared up for American football (plastic pitches)..They actually lay turf down on the plastic when they play the round ball game,rendering them unplayable in most players eyes.They would never stand up to 80 mins of RL.
Other smaller venues with grass pitches,just don't have the facilities to accommodate.Suppose it depends on how much they are willing to chuck at it.
Then theres the consequences of England losing the bid and missing out on the additional £10m community and grassroots government funding.The game needs the money here first.