The NFL has no small influence in the type of entertainment which will be presented during halftime in the future. They may not be directly to blame, but it's still a sin of ommission. If they hear from enough of us, they will be very careful to have contracts written in such a way that penalties or forfeiture of future business dealings with offending companies will apply.
It's just common sense, and these type of business forces are used all the time.
Because the NFL is notorious on micromanaging everything in their purview. It's hard to believe that they didn't know what the halftime show was going to be like (and I'm not just talking about the nudity -- the whole show was nauseating.) And also, because of this, from today's Daily News:
http://www.nydailynews.com/sports/story/160822p-141073c.html
Bono and J-Lo wanted to sing a new song they recorded together, "An American Prayer," which highlights the fight against AIDS in Africa. The NFL said "no" to Bono. "We simply decided that we are going to deliver, as we do annually, an extremely entertaining halftime show," an NFL spokesman said at the time. "We don't believe it's appropriate to focus on a single issue." Unless, of course, it is Janet Jackson's star-covered breast.