Say it costs £300-400m, we could probably get naming rights for at least £100m, and then other commerical tie-ins along with that, you might be able to pay for half of it through that alone. Obviously I'm very far from being a financial expert, but I'd sooner the club have say £200m debt than compromise what we want for the stadium by sticking a running track in there.
£200m sounds like a lot of debt, but it's not really anymore. We're getting in excess of £100m a season in broadcasting rights alone, not including foreign broadcasting rights, and both are projected to increase further. We've got a player worth possibly £70m alone, and squad players like McCarthy and Deulofeu are possibly worth around £20m each.
In a new stadium we would have a lot more executive boxes, and much greater matchday revenues generally. Let's build what we want for Everton and swerve things like Commonwealth games tie-ins, which are very short termist.