The biggest obstacle is the track. Select AMA teams have tested at Indy and pronounced the existing road course unacceptable, due to the fact that it incorporates Turns 1 and 2 of the super-speedway, with its immovable walls waiting to collect a fallen rider. But FIM inspector Claude Danis has also visited the track and come up with a workable solution: The road course would be run in the opposite direction from F1 and a new infield section built to eliminate the banking. Considering that the speedway built the road course just to host F1, they'd almost certainly be willing to modify it to get a MotoGP date. And by that we don't mean the haybales, traffic cones and 55-gallon drums the AMA has traditionally employed to reconfigure super-speedways for motorcycle racing.
At present, the plan is for Indy to join Laguna Seca as a second USGP, but reading between the lines, one gets the feeling it's just as likely to replace it. And with both Barber and Miller negotiating to host World Superbike rounds, Laguna Seca could be left with nothing more than an AMA national, which assuredly won't attract the 144,000 spectators the 2006 USGP did.
All of which is a long way of saying you should make the effort to go to the USGP this year. If not, don't complain when you have to watch it on TV.