You aren't removing the entire process at all, you are removing just one step.
I don't really think that we need to remove arena building, but i do agree somewhat that it really doesn't have to be as pronounced as it is now. I think it's something that could start closer to 8k-10k seats and then people must decide how to further build it out from there. You'd take a few million dollars out of the process by removing some expenditures, you'd increase the overall funding in the transfer market a few different ways (although teams can still blow all of their money on a huge salary player), and maybe save some retention of the playerbase that might get bored of not being able to realistically compete for IRL years given the pace a season travels in buzzer beater.
A quick look at the NBBA in America suggests about 12-15 seasons for most of those returning to play or maybe playing for the first time is required to get your team to the top if you understand game mechanics. It's at least 3-4 seasons after building ones arena to get to the point where you are able to get to Division 2. So most teams will still require at least 1.5 years to learn the ropes.
I hate removing arena building altogether, so i will stand with you and others there when it comes to it's outright removal. However, i think there is a happier medium to this that we can find and try to keep more people playing, because the more that are playing the more challenging it gets to be at the top, and i think that makes it more fun.