There have changes recently in how many facilities deal with MRSA, but not necessarily C-Diff. At one time, it was assumed that contact isolation for patients with a MRSA history and/or current colonization would reduce the spread of MRSA, although we now know that it doesn't. Universal precautions and standard hygiene (including hand gel/washing) is just as effective. We also assumed that there were no adverse consequences, although we now know that contact isolation significantly worsens patient outcomes and is a safety issue for patients. Now knowing that there is no benefit but there is harm to the patient in using contact isolation for MRSA history/colonization, many facilities no longer use isolation in these instances. The evidence on active infections, particularly those with active drainage, is less clear.
C. Diff on the other hand is a bit different. Unlike MRSA, hand gel is not sufficient. Also, chlorine based cleaners need to be used for the room and equipment. At my facility, we have stopped putting people on C.Diff isolation just because they have diarrhea, but we still do for confirmed C.Diff which I don't see changing anytime soon.