Of course Rodrygo could fit into Real Madrid's plans and he has those qualities inherent in him but even then among dozens of players, he may not be getting the support he deserves with Madrid. In many cases it is clear that his priorities have dropped and he is also moving away from the manager's plans. In terms of terminology there may be a stark difference between Luka Modric and the emerging top player of Brazilian origin,Because we all know about their positional strength. In fact Real Madrid's midfield reliance was mainly on Luka Modric, so we didn't see him on the bench for much time but Rodrygo was on the bench for a long time even in important matches.
That's right it's not as if Rodrygo can't play for Real Madrid, he has the quality to play for them but he is just not wanted by the new coach maybe because he doesn't suit his pattern. It happens sometimes when new coach is brought to a team not all players are wanted and he drops some even if they are good players. Modric is probably lucky that no coach dislikes him he is very good and has convinced everyone how reliable he is but Rodrygo hasn't done that because he plays from where he is not too comfortable.
Also in an interview Xabi Alonso says that the reason he does not start Rodrygo is because he does not fit into his style of football . If it turns out that Rodygo leaves Real Madrid i think that Real Madrid will be losing a good player from the squad.
Rodrygo is a very good player and Real Madrid will be losing a very good talent. It's not the end of the world, he is still young and can still find a decent team, a lot of top teams are already seeking for him. This kind of situation happens a lot for a coach to say a player is not in his plans, Chelsea coach also did it to a lot of players so it's not new.