Not sure how patient the Brewers can be as Chourio and Black will be in year-1 in AAA next year. Gasser already has a 1+ years in AAA so he should be ready. That leaves Misio, Quero, Rodriguez (RHP) and Wilken as the prospects the Brewers would be waiting on next and they are all in AA and AAA and then you also have Brown. Wilken probably starts out in AA but Misio, Quero and Rodriguez all probably start out in AAA. That AAA roster is already getting packed and you have to keep some organizational guys in there to move up and down from AAA - MLB club for injuries. This isn't even taking into consideration what you would be getting back for Burnes.
If you go more than 2-years I think you have to throw in the won't offer a QO after the third year type of a deal.