It is probably good for him, PSG and Ligue 1. He will be the main striker at the club.
But I'm not sure what are the long-term consequences of his huge transfer fee on the player market.
Well, even though I am totally behind him and his transfer, as you pointed it out, his transfer might be the entry point for many huge bills transfers. Just one year ago Pogba looked liked if he was totally expensive and someone will never pay more. But now you have Mbappé, Hazard, Neymar, Coutinho and so much more players that are above the 100M$ mark, and that is a bad news. Price is rocketing. As Mourinho said, Neymar is worth his price, but the problem might be that some palyers become overvalued.