And for this reason, I think America needs GP2.
This year, GP2 and GP2 Asia were amalgamated into a single series, with GP2 expanding its calendar to include some international races. Sepang, two rounds at Bahrain, and Singapore were chosen. But come 2013, I think the series could expand out to support the Canadian Grand Prix and the Grand Prix of America. If Malaysia and Singapore are within range for GP2 teams, a quick tour of Montreal and New Jersey certainly is.
What GP2 needs to find is a reasonably-talented American driver. It is believed that Alexander Rossi will join Caterham in for the 2012 season, and a few drivers could probably be found in GP3 (ATECH-CRS already has one, Ethan Ringel). An American GP2 race featuring an American driver would given the American public someone to follow from the outset of their career. GP2 has proven to be highly-competitive (they even made Yas Marina look exciting), so an American driver showing their racing prowess there has the potential to capture the public's attention. And, if they follow through to move up to Formula 1, the public will have someone who they can follow for the length of their career. I think this would be cheaper, easier and far more likely to happen than finding someone who simply steps into the car and wins.