Well, it's theoretically possible, but highly unlikely. If you hit the timing absolutely perfectly and don't have to wait anywhere for more than a couple of minutes at MCO, then happen to be the first stop that the bus drops off at, then you could be at WS close to 11:00 a.m. The chances of that happening (which doesn't event account for the possibility of a late flight), however, are slim and none.
It would not be wise, therefore, to plan on being able to meet that timetable. For planning purposes, you really should assume that DME will have you at your resort by 11:00 a.m., add a few additional minutes to check in, store any carry-on bags, etc., then account for another 45 minutes or so to get to Epcot and a little more time to get back to WS. If it were me, I wouldn't make any plans for WS until at least noon and probably not until 12:30 p.m., just to be safe.
If you absolutely have to be at WS by 11:00 a.m., the only way to give yourself a fighting chance is to travel with carry-on bags only and take a cab or a town car from MCO to POP, then a cab to Epcot. Even that will have you at Epcot by 10:30 a.m. if you don't have any hitches in the process, then you'll still have to get through FW and back to WS.