One way or another, the Jays have to make a decision. They made one with Grichuk. If they want to extend Stroman, do it now or prior to the trade deadline. If one or both sides are so far apart that there is no middle ground, then go for a trade. Can't afford to risk another JD situation where the asset value is practically nothing because they waited too long, or a Happ situation where Billy f'n McKinney is the main prospect coming back.
I'd honestly be disappointed if Stro is traded. Say what you want about him, but I enjoy watching him pitch, and he likes taking the ball in the big games (ex. starting game 5 of the ALDS and saving us from a David Price implosion, starting the WC game despite everyone saying to start Liriano, etc). There is a confidence when he is on the mound. He's not an ace but he's really good. I'd try to keep him around.