If a user has a 4/5 router they are almost certainly 1) held back by cost concerns, 2) speed isn't a priority, 3) compatibility/functionality would be the priority.
A WiFi 7 router that is tri-band is usually MUCH more expensive than a 6/6e router.
This is the first time in Networking where I see the potential for the market to drag its feet more than usual for new technology. WiFI 7 tri-band is a great technology, but it has its caveats and that could probably be addressed.
And the current US Government
just gave a potential nod to the 6GHz spec to Wireless providers. Nobody knows how that may potentially impact Tri-band WiFi 6a/7 routers already in place...