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I like the fire Maurer showed out of the bullpen and because of that, it's tempting to think about how that could work in the rotation. On the other hand, what's coming out of the bullpen is working pretty well, so why mess with it?
Honestly, I don't know how you make this sort of decision with either Maurer or Wilhelmsen. The physical tools seem to be there with both players. Probably, it comes down to a judgment call based on less-easily defined factors like "makeup".
One item to consider with both players is that they would have the advantage of making the transition to the rotation with excellent defensive catchers behind the plate in Zunino and Sucre (assuming Sucre is the backup in 2015).