Urriak Uruk
Gaming is fun, and fun is for everyone
But a spellcaster can still participate. They have weapons, and can still provide concentration spells. They can still have been fun and be helpful.
On the margins, sure they can be helpful. But no, I don't think spellcasters would have much fun; it's the big reason why 5E made clerics more than just healers, as buffing and healing isn't usually much fun. People like to make stuff explode and kill the bad guys, and this would remove that for spellcasters. Most players who enjoy spellcasters would not enjoy such changes to weaken them.