Of course. ut Party Starter is different to Switch (however much people play it off as a similar club track). It will bring new fans to the album, not as much as opening weeks sales but will up it to the 20k p/w on a longer term of consistancy.
Course album sales are down right now, the Switch and the proper Will fans own the album, the rest (The old fans, the curious, The HipHop heads, and the need abit more convincing) will come, if Interscope pull their thumbs out their arse.