The problem with a lot of the arguments for
"we will never fail" is that they are based on where the game was, not where the game is now ...
Since the second world war until probably as late as 2010 football clubs income came primarily from the paying customers, the fans. During that entire period Arsenal were at the top, or at least very near the top, of the revenue generators, we could employ 'unknown' managers who could be brought in and given the financial means to compete with the very best, using our financial clout to buy the best players both senior and junior ... but all that has changed
Before 2010/11 the TV revenues shared in the EPL were 400m a year - in 2011 that jumped to 900m a year - by 2016 it was 1,600m a year - by 2019 that was 2.6 billion and who knows where it will end up.
Add to that TV money the likes of Chelsea, City, Leicester, Everton were all getting wealthy backers - West Ham and Spurs got new mega stadiums and suddenly we were no longer one of the few wealthy clubs, we were just one of many wealthy clubs and found ourselves a step behind the elite.
To argue nothing has changed, that managers and players, and indeed young fans, will still see Arsenal as a "behemoth" that's simply not true ... we may still be a giant but we now live in a land full of giants ... we need to learn to compete, and we need to do it fast.