Personally, I don’t think Turkey brings anything to NATO
Apart from control over the Bosphorus, and a lot of staging points for NATO forces for middle eastern adventuring.
They buy a lot of guns as well, so the US will be keen to keep them.
The downside is that it is rubbing up against even more unstable areas and the mutual aid treaties mean that NATO forces could get dragged in.
It’s hard not to be suspicious that Erdogan is pulling a fast one with the veto in return for some quid pro quo from Putin.