Barcelona are a disaster and I'm surprised people are starting to change their minds just because they've had a good half season (and might win the league).
Even if they win the league who cares? They have won 26 league titles in their history -- does the world suddenly change because they have won 27? If you are a non-elite club like Leicester City or Tottenham then sure, winning a title is a generation-defining event and the fans who witness the success will talk about it for decades. If Leicester got relegated next season then the fans who watched them win the title will still brag about the title forever, and tell their grandkids about it. But if Barcelona win another title then so what? Every Barca fan has seen them win numerous titles already, its just not a huge deal. Yeah it sucks that they've spend the last 5 years lagging behind Madrid but that's just life.
The basic fact remains that they have mortgaged their future just to win the league this year, and its not obvious how having one (or two, or three) extra titles is going to increase their revenue to make the short term borrowing worthwhile. The title they win this year is likely to come at the cost of making them less competitive in 10 years time. It still seems like sheer short-term folly by a president who is desperate for approval, and nothing changes whatever trophies they might happen to win in 2023.
It Is true that a short term period of success can fundamentally change the direction of a club, but this can only happen during a unique period where "the world watches the club" and a new generation of fans gets permanently addicted to them. Barcelona kind of had this with Ronaldinho -- before him, they weren't really considered a prestigious club, but he was just so, so good and watchable that people started tuning into Barcelona games, and many of those fans stuck around (R9 was kind of similar I guess, but not to the same degree). But that really isn't the case just now -- young 16 year old kids just aren't tuning in to watch Gavi and Lewandoski in the same way that I tuned in spellbound to watch Barcelona back in the 1990s FatRonaldo days, or the way that Ronaldinho was watched in the early 2000s. Barcelona might win the title but they aren't a club that "you have to watch" like they were with R9/Dinho/Messi -- they are just a typical "normal" club winning a title. Pedri and Gavi just aren't "cool"/special enough to win them a new generation of fans, even if they do win the league. Ironically, Neymar might arguably have done this If they managed to keep him.