It would be good to see him destroying Bayern. I don't really think it will be possible for him to flip round a 4-0 deficit, even if the rest of the team are on top form as well (though what was it Pep once said about questioning Messi's abilities?). Though I do think it is possible, and hope it happens, that Messi goes out there a puts on a real show to quiet down this Bayern bandwagon.
On another note, remember that The team will will be added to in the summer, and next year we will hopefully have Tito around all year. Can't be easy for himself or the team to keep performnces near 100% throughout such a tough year, let alone win the league comfortably and make champions league semis at least, for now.