no. First off, Galaxy is only selling ~33k WW with Mario Kart and NSMB already out the door and is currently around 8.3m. If those two games were really going to boost a 3D platformer's performance I would expect better legs (say 70k during the holidays and in the top 25 Wii games rather than barely breaking the top 50)
To beat Mario 64, it also has to beat Galaxy 1 by ~3.6m units which I don't think will happen. Honestly I expect Galaxy 2 will probably tie Galaxy 1. Mario may have gained in popularity, but Galaxy also launched as the main 3D Mario for the system. Just like most other games, the sequels on the same system typically sell worse. This is most likely as some players already got their fill of that kind of game and have limited budgets and number of games they buy. If the attach ratio is 8 games, do people really want 1/4 of their games being Mario 3D platformers? I feel these factors will offset and end in a tie for sales.
EDIT: as a note, Galaxy 1 could beat Mario 64 sales, but it would have to stay on the market for at least another 4 years unless sales sudenly jumped and sustained higher sales. So, stating that Galaxy 2 won't beat Mario 64 is based on the next generation of systems coming out soon enough that it can't sustain good sales for another 6 years.
Essay Pro