It seems the talks between WWE and Fox are very real because Michael McCarthy from The Sporting News claims that Fox is open to ending its relationship with UFC should WWE agree to air its content on the network. That's a bold move and essentially brings WWE under the Disney umbrella because the House of Mouse is currently in the process of purchasing the network and its affiliates.
"[Fox] is definitely trying to get [the WWE]," McCarthy claims. "They’ll pass on UFC, then use ‘Raw’ for [Fox Broadcasting] and FS1 content." He goes on to note that both WWE and UFC are looking to get $400 million a year in TV rights and it's reportedly far more likely that Fox will pay that sort of money to WWE over UFC. However, that could result in a significant change to RAW!
Apparently, the Monday night show would be trimmed down to two hours and air from 8 - 10pm because most local Fox networks air local news at 10pm. That's not confirmed at this stage, though.
It's also worth noting that Fox Sports executives Colin Cowherd and Jason Whitlock recently attended SmackDown Live and the former teased on FS1 that wrestling is a, "very good sport…coming to a network near you." WWE will remain at USA in 2018 but it now seems changes could be coming...