Agree.
When you consider unproven midfielder Lavia was sold by Southampton to Chelsea for £58 million.
Guehi is an established Premier League and International player, who's only like to get better.
He's very consistent and has an excellent temperament.
Ultimately I suppose it's what the market will pay and and, as far as can be ascertained, Newcastle seem to have little or no competition for Guehi's services.
Personally, I hope he stays.
Furthermore if ,for example, we give a big and lengthy contract to Joe Gomez (who I believe is only a year younger than Anderson and more injury prone), part of me thinks we may as well have kept Anderson.