In order to want to sign Messi again, Barcelona are willing to lose 11% of broadcasting rights because they will sign a contract involving La Liga and CVC Capital Partners. I don't know if it's the best chance for Messi to wear the Barcelona jersey again, but yes I think he still really wants to do it.
La Liga is definitely loosing a little bit of its glamour without Ronaldo and Messi. Barca is in big financial problems and they will have to turn to their youth players a bit more rather then buy everything on the market for the next couple of years. I actually think this is the best thing that could have happened to Barca. They were always the good when they had a couple of their own, home grown, players in the team.
I know that's true, but they have changed over the last few years because they are more interested in buying players in the market than giving their players a chance. Maybe due to financial problem they can switch back to their old habit of giving playing time to players who are coached by their own academy, some of them are quite good like Puig and Ansu Fati.