Inception ending was a trick. The wedding ring was his token. But it only showed up on his left hand when he was dreaming AND thinking of his wife.

If you didn't run to the bathroom, you'd remember the *top* belonged to his now dead wife. Also he couldn't just fly back to America to see his kids. The FBI was hot on his trail for "murdering" his psychoticly suicidal "trained" wife.

So stop looking at the spinning top you tea partiers! Do you know nothing about bait and switch? That was the whole point of the vault scene! They programmed you by Inception!