Yeah, no. The Fighter doesn't have access to wall of stone. The Wizard does. You can tell, because it is a Wizard ability and not a Fighter ability. The Fighter saying "hey you could use your abilities to do X" is at best deciding how the Wizard uses his spotlight time (which is still not the Fighter's), and at worst an attempt to hijack someone else's character.

If every problem gets solved by the Wizard using an ability it doesn't matter if sometimes it's the Rogue or the Fighter's player suggesting what ability to use. Their characters are still unimportant and do not get any spotlight time. Because they don't have abilities that put them in the spotlight.