So what if Marvel remained independent and had the resources to purchase Lucasfilm? Say that the 1990s are much kinder to Marvel, with no bankruptcy scare for one, allowing them to be stable enough to acquire the other company?
I guess the result depends on when they acquire LF - before the prequels, before Episode VII, etc.
Obviously LF's tech and experience would be helpful in creating the Marvel films, but I doubt that Marvel would have the massive amount of money that Disney has OTL to throw at the films, even if Marvel does better than OTL.