Honestly if what we can get now is Draxler, who is talented but also a big question mark, the best thing to do would've been to keep on Vidal.
Renew his contract, give him a little raise. If you wanna sell, do it next year for 30/35M, it would be perfectly possible.
Point is, only do it if there is a way to secure a top guy for AM, not a big gamble on a foreigner kid who's been injured a lot. This is why I don't agree with this selling.