She might get pissed, or have her feelings hurt, if you cast away Mr Beer so quickly. Women are funny about having their gifts appreciated.
There isn't any reason to discard the Mr. Beer. You can do all grain 2 1/2 gallon batches (BIAB in the 20 qt pot works great) and they fit right in that little brown keg. I've done several batches that way (except I don't have the little brown keg).