I agree with you. Real Madrid will really be superior in La Liga next season. That's because they managed to get Mbappe and they still have the same squad as this season's squad. Even though Kroos has decided to retire, I think Real Madrid still has other players who can replace him. Young players like Arda Guler could also be an option because he has trained with Kroos. Barcelona is in a financial crisis and no other team is at the same level as Real Madrid. I think we will see La Liga like the Farmers' League for Real Madrid next season.
La Liga will not be a Farmer's League next season because the competition will definitely still be fierce even though Real Madrid's potential to become champions again in La Liga is very wide open and the possibility could be real. However, it should be noted that La Liga will still have fierce matches and will not be a Farmer's League as you mentioned. I also admit that Barcelona is facing a crisis and Real Madrid is in better condition, but for the matches next season it will always be difficult to predict because anything can still happen in La Liga next season.
Yes, although currently Real Madrid is expected to perform well if you look at the squad as a whole. Especially after the arrival of Mbappe from PSG, most people probably think that Real Madrid will be unmatched in Laliga next season. However, in reality, I also believe that it will not be easy for Real Madrid to achieve an easy victory in Laliga. Because of course other clubs in La Liga are also trying to improve their respective squads. So if we assume Laliga will become a farmers' league just because Real Madrid has a superior squad, clearly that assumption is not correct. Because even though currently its rival Real Madrid (Barcelona) is experiencing a downturn in terms of its finances. But what is certain is that Barcelona will continue to try to make their team better even with the limited money they face.
Apart from that, teams like Girona and Atletico Madrid will not remain silent watching the process that Real Madrid is building. Of course these teams will also build their squad to the maximum as well. Moreover, as we know, Girona is able to compete with Real Madrid this season, so it is certain that with the solidarity that Girona currently has, it is certain that next season they will also be very tough competitors for Real Madrid. Moreover, from the news that I know, Girona has also brought in Abel Ruiz from Sc Braga and also Donny van de Beek from Manchester United which will definitely make Girona's squad even better next season.
So in conclusion, Laliga will definitely remain a very competitive league as usual.