WNBA in Nashville?

The following article hypothesizes about a potential expansion of the WNBA into Nashville, Tennessee.

I wouldn't mind seeing the WNBA in Nashville if Nashville citizens wanted it. Nashville would probably be the only city I wouldn't mind taking a road trip to to see the Dream play.

Also, note at the end of the article:

The league eventually hopes to expand to 20 teams, and though Orender couldn't provide a timeline for a possible Nashville team debut, she says she's sure "the positive buzz will help feed the momentum."

Twenty teams? Is that a number like that $700 billion number, one pulled out of thin air?