As the following article points out, restarting the XFL is definitely not without risk.

After one season and flagging ratings, NBC said that they would only continue to broadcast the XFL if it replaced the second hour of SmackDown, something that McMahon was not okay with.
This led to the early demise of the XFL.
It is estimated that both WWE and NBC Universal lost $35 million of their $100 million investment. ...
It's a big risk for WWE and Vince to bring back the XFL after the disaster it was the first time. With the ratings of the NFL and television in general being on the downward trend thanks to new media, this is definitely a risky proposition for WWE.
https://www.sportskeeda.com/wwe/wwe-...mahon-runs-wwe