It will be at least 9-10 years before Google could bid. I think the TV networks get a chance to renew before anyone else can even bid. Unless the NFL decides to do something with the NFL Network games they are likely SOL.
ESPN renewed their MNF contract through 2021. http://www.nytimes.com/2011/09/09/sports/football/espn-extends-deal-with-nfl-for-15-billion.html CBS, FOX, and NBC have renewed their contracts through 2022. http://www.engadget.com/2011/12/19/nfl-renews-tv-deals-with-cbs-fox-nbc-for-nine-more-years-mone/
