Coutinho is worth about 100m, Rakitic about 40m, so those two plus 100m for Neymar is pretty good. He is 27 so should have a good 5 years of his prime left, providing he can avoid long-term injuries it is a good deal. If Umtiti is added to that then it is not such a good deal, and a disaster if Dembele is part of it. If we keep Dembele, then he can go back to the right with Neymar on the left and Messi in the middle, that would be pretty spectacular to watch.
Not sure I want Neymar back, but it would be exciting, which would be a nice change these days.