Something that was not mentioned in the WrestleMania announcement is the status of NXT Takeover: Tampa Bay and the WWE Hall of Fame.
Both shows were taking place at the Amelie Arena in Tampa Bay, with the Hall of Fame induction ceremony on Thursday and Takeover on Saturday night. In its statement, WWE only mentioned that WrestleMania will stream live.
An option for a Takeover would be to air that same week of WrestleMania, but on Wednesday night instead of the usual NXT on USA Network show. WWE could potentially ask for a third hour on USA Network that night and as things stand right now, any new, live program would be gold for any television network.
The Hall of Fame is a totally different scenario and could be held off to a later date.