Vince's level of talent is certainly subjective IMO. Sure, he's had some success but I would never put it on the same level as ANY of the Eagles from 1972-2016.
Let me say this:
I would never want ANYONE to replace Glenn, but if Glenn were alive and they wanted to add somebody, as an example - Vince would never have crossed my mind as a good choice for another guy in the band at any point in those years.
He's just not Eagle material, let alone fit to try to stand in Glenn's shoes. I wouldn't want him in the band as a backup guitarist, let alone as a singer and a so-called replacement for Glenn Frey. He's just not up to that caliber IMO.