I don't think it is right to say that they have no future. They are still around, have tremendous resources I guess and they have a big name in the football world.
All of this is worth nothing if they don't make use of that potential, but if they can find someone who is able to consistently improve the team over the years, Manchester United could still be one of the strongest competitors in the EPL.
The status quo is indeed not very good. The Europa League final was more of a coincidence and now they have to start all over. They won't play in the CL, ruined their reputation last season and finding great players who are willing to be transferred to them is hard because the players that Manchester United needs and wants, they usually want to play in the CL.
Next season will be crucial for them because they need to qualify for the CL again.
The biggest achievement of Manchester United last season was avoiding relegation. Since they are still in the Premiership they still have the opportunity of coming back stronger next season. The club had the necessary resources to get the best players in the world. But the task before Ruben Amorim is how to assemble the best players and prepare them for next season.
Amorim disappointed United's fans last season because they believed he would change the club's fortune after sacking Erik ten Hag. But the excuse was that he came when the club was already in bad shape and the players were not his choice. There will be no excuse next season because he will be given all the support he needs. Qualifying for the Champions League would be his benchmark.