Yeah, no. There might have been/probably were odd fans here and there who said, "Ooh, Boba Fett, I guess I'm buying that ticket after all!" But the overwhelming majority, >99.99%, were already going and/or didn't care.
I was about 13 when AOTC came out, and I remember plenty of friends who were stoked to see it just because Boba Fett was in there. Having lots of Boba Fett (well, a Boba Fett stand in) in the movie, including a scene where he has a fight scene with Kenobi, was just pandering to the audience. I honestly can’t believe people won’t accept that.