Yes, I also think that it's a good decision for all of the parties involved, Martial, UTD, and Sevilla. Martial has got another chance to revive his career, United has got rid of a player they were not playing as they have a huge lot of options in their attack, and Sevilla has got a young exciting prospect to play him for half a season and decide whether to finally buy him or not as he came in loan.
I’m really happy for him and there’s no doubt in my mind that he’ll be an instant success for Sevilla, but is this a farewell I highly doubt so, because his situation will be same like Lingard next year, and he’ll probably be priced out of a transfer and to make matters worse if the new coach doesn’t like him then he’ll end up warming the bench. Furthermore I hope Sevilla can find the cash to buy him next year, because he definitely deserves more playing time but Manchester United won’t sell him on the cheap.