The conversation around Martial reminds me of when fans used to stick up for Anderson in the final years under Fergie. He was such an exciting prospect when we signed him as a teenager, had a promising first season, and has declined over the years due to poor form, injuries and seemingly not having the hunger to fulfil his potential.
Anderson was one of the very few players who Fergie wasn't ruthless enough to get rid of when they were underperforming. Since then, we've seen far too many players stick around for longer than they should have done because the alternative is to spend more money on a replacement. Hopefully that changes under new ownership.