By doing that Barca risks getting much lesser offers for an older player that would have failed miserably at Barca, at least atm he doesn't have that tag printed on his face and ofc it is hard to believe he'll now make the season of his career to shut everbody's mouths..
If we sell him, we will get no one in his place. I'm pretty sure of that. One extra option doesn't bother me. By the next summer we will have a better idea about who can be counted on, and who can't. It's not very probable that Arda will have a very good season, but it's a possibility worth considering at this point.
Everyone is going way over the top with how shit he was, without even waiting to see if those 6 months without competitive football had an impact or not. He clearly didn't have match rythm, and you don't have to be a genius to realise that can very well be down to his half a year of inactivity. For me, there's no harm in giving him a legit shot to prove his worth.
I suppose if Andre Gomes will have a bad six months at the team, everyone will be crying to sell him in the winter transfer window.