Going to PSG destroys careers, so he'll learn the hard way. But if he's expecting PSG to let him go in 2 or 3 years, he has another thing coming. They're a hard team to escape.
As I said, PSG may seem like a big club.... but they're not. They only recently became a decent side 6 years back. Their record in the Champions League is awful, despite them spending nearly 1.1b on players. Imagine having teams like Liverpool, Juventus and Barcelona going after you and then choosing PSG.
He apparently said he won't grow at Barcelona..... but he will at PSG? He'll get more playing time at Barcelona than he will at PSG.
Anyway, I don't really care all that much now. It's his career, but I feel it's a worse move than going to Man Utd. At Utd he'll play against better teams and better players each week.... at PSG he won't. This honestly could destroy his potential.