I see it the opposite--at least NASCAR and NBA have some sort of hook. I don't know that "Xfinity" tells Joe Tourist, "hey, you can watch your favorite game here."
Then again, I question the viability of any sports bar in CityWalk--Universal doesn't have the captured market of hotel guests with crappy cable that WDW has, too much trouble/too expensive for Orlando locals to head over for a regular game. And to quote Jon Taffer, sports bars only give you 70 nights a year anyway.
It's called the NBCSports Arena. "Xfinity Live!" is the name of the "district" in Philly next to the Linc/CBP/Wells Fargo Center. Obviously they wouldn't name it Xfinity Live! in Central Florida. It's not as recognizable a name as it is up here. I was just posting the link to basically something that exists that will most likely be duplicated to fit inside NASCAR.