Many options.
Hoping everything goes as planned, we might have some fun match-ups.
If Conor dusts RDA in under one minute, Conor vs Aldo 2 at UFC 200. No other fight that makes sense would create as much hype as this one.
A return of GSP as a co-main would be amazing. If Anderson beats Bisping in dominant fashion, I can't see a better timing than to make the superfight we always wanted, GSP vs Silva @ UFC 200. If Conor gets destroyed by RDA, this can even be main event.
Third fight needs to be a good old HW showdown. Big names. Something spicy. Overeem vs Velasquez is type of fight I'm talking about.
Forth fight freak show. Rumble moving to HW facing Mark Hunt. Or Nick Diaz fighting anyone.
Fifth fight, next person to fight Conor, something like Edgar vs Holloway or Alvarez vs Nate Diaz.
McGregor vs Aldo 2
St-Pierre vs Silva
Velasquez vs Overeem
Johnson vs Hunt/ Nick Diaz vs anyone
Edgar vs Holloway/ Alvarez vs Nate Diaz