Is this the final lap for F1 in the USA

As Formula One returns to Indianapolis this weekend, the series future is at a serious crossroads following last years tire-gate fiasco. All but six cars pulled off the circuit during the parade lap and did not take part in the race, citing safety concerns with their tires. With this Sundays race being the last under the current contract, there are questions whether it will return, not just to Indianapolis, but the United States. Source: http://www.tsn.ca/auto_racing/news_story.asp?ID=170010