Let's say we defeat UEFA in courts - G4 will only laugh, change their masks and launch the Superleague with 'Fair play with no Oil money and incompetent UEFA' slogan. Our only chance to survive is creating a breakaway competition on our own terms, it's clear as day. The bastards won't leave us alone in any other scenario.
This won't happen for 4 reasons.
1) If FFP is ruled illegal, they can't just set up another competition with similarly anti-competitive rules around fair play and spending caps.
2) We already know from the leaks that the Super League plans were really just to put pressure on UEFA to give big clubs more money, and the public outrage in Germany made it clear that Bayern simply can't do it.
3) We are in the Super League plans anyway. We've become too big to leave out. There is no credibility to starting a league without the best team in England.
4) FIFA ended any chance of a super league by declaring any player who played for a club in a breakaway league would be banned from international football.