It may be showing its age, but the stadium was designed and built to in a manner where it could last for decades to come.
I agree in that either the stadium either needs substantial renovations or should be torn down and rebuilt. The problem with renovations is that the costs would be so significant, you might as well tear down and rebuild. Rogers is a cheap company so I can see them looking to sell a portion of the team in order to finance whatever option they choose. That or they'll just divest themselves completely of the Jays (which would be no easy task).