It's probably time to spend a bit of money in the offseason. And they'll have a boatload of prospects to trade for an arm. If they trade for one arm, and sign a couple others they could roster a pretty good rotation. Free agents this offseason: Bumgarner, Cole, Gibson, Hill, Porcello, Ryu, Strasburg, Keuchel, Wheeler, Wood.
Signing/Trade
Signing/Trade
Shoemaker
Thornton
Pearson
Borucki/Murphy/SRF/Gaviglio
Even if the team trades Stroman, the rotation only has to be a problem if the team tucks dick and acts like a mickey mouse organization this offseason.