Here's how: there aren't enough Leftist American Football fans in this country to save the NFL.
Thus, the NFL will continue to bleed money until it fails, and then a new league will be formed which doesn't permit such shenanigans. The NBA already does this.
they can focus their attention om getting more fans from the WNBA.
Not too sure. Seattle fans are a bunch of rich Democrats - that’s one example. Another example - this one in the NBA: Golden State fans are a bunch of rich privileged Democrats.