Factor in the location, and you'd have to pay Rogers an exorbitant amount to break their lease.
I will admit some bias here - for me the Rogers Centre is the last product of an era when Toronto had big dreams and was bold enough to implement them (as far as infrastructure is concerned).
The experience when the roof is closed isn't great - but I've never had a problem with it when the roof's open on a sunny day. This is especially true when the stadium's full.
From a practical perspective, the location and renovation options seem to eliminate everything else as a possibility.