Speaking today with the CO station manager I asked about the 767 rumour. He told me that they will only send in a 763 if there is no 75W availiable.
You will never see a 777 at BRS from any airline for the time being. If you go back a few pages you will see figures to sugest that a 777 is too large/heavy and that wingtip clearence would be a problem with the old terminal. Its the same reason why you won't see an A330/340 at BRS. Nor does the route warrent the use of a 238 seat aircraft when they can't fill a 172 seat 757.
Assuming that there is a load of 4 first and 102 economy and 92 bags. That would give us a load of 10513kg (Adults @ 80kg, Bags @ 20kg). According to Boeing the DOW for a 777-200ER is 142,430kgs. So we have a ZFW of 152,943kgs. Now lets add say 70,000kgs of fuel (may need more, may need less) and we get a TOW of roughly 222,943kgs. At that weight a minimum runway length of roughly 2147m is needed.
*None of the above is actual. It is all assumed using generic data availiable on the web. Take off performance figures are for the 777-200ER prototype and were obtained from the Boeing website.