I think Dempsey probably brought them to Tottenham and Bale will keep them around.
Bale is the ultimate sports star for Americans. We all love the clutch performer, the star player, the guy who is not only awesome but he's an awesome person. I can guarantee you that Dempsey did bring a bunch of fans to notice Tottenham from America, but Bale is the reason many of them will also be sticking around long after Dempsey's departure.
I do appreciate Dempsey as a footballer and I won't forget the two goals against United this year. He at times was a valuable member for the club and other times was just a whole bunch of 'meh.'
I'd personally love to see him at Everton. I think it's the perfect level for him and with Everton's past/current success with Americans, I can easily see the fit.
Good point but a bit of a reach. no Champions League = no attraction of casual fans