Then all those players will have to go to lower clubs because they won't get it at the top clubs. Nor will they be demanding to start every game like the Martial fans here.
I'm secretly posting I work, I can't be doing in depth research
Transfermarkt has Martial as missing 5 games from injury anyway and two games on the bench after returning so not like he has been fully fit the whole time either.
I'm rejecting that excuse, these are high profile injuries.
But no, they don't necessarily have to move at the exception of Kovacic and Asensio who should think about it. Tolisso joined his club this season and the manager changed, so you can understand the context, Thiago is a starter for Bayern and would have played a lot more without his injury, Dembélé we don't know but he was injured very early during his first season, Coman was playing more and more.
You can't just do what you did and name players because context matter, in the case of Martial, we are talking about a productive player who is at his current club since 2015, he isn't being eased into a team, he isn't coming back from a big injury and he isn't injury prone. Also my remark concerns the player position, while it's obviously good for United or Real Madrid to have Asensio, Martial and Kovacic as squad players, it's not good for the players development, if it wasn't for money none of these players would even be close to that situation, they would be playing week in week out for decent teams like Monaco, Dortmund, Valencia or Inter.
This is one of the most perverse consequences of money concentration in football, at 23 Zidane was playing week in week out for Bordeaux and he was far better than Martial.