I love the WNBA!! I would like to see the league grow to 14 teams at some point in the future. However, I must agree with Jordy that the league must also be balanced and ready for expansion. Having a team (
Indiana Fever) that has only 2 wins (they won their 2nd game of the season yesterday) out of 18 games should give pause for concern.
ALL 12 teams should be competitive BEFORE any serious thought of expansion can take place. It's like having an 8 cylinder engine but only 7 of them are working, yet you want to push the engine to go/perform at greater speeds for long periods of time without damaging the engine.
I believe there are several cities that could and would support a WNBA team, however, you never want to dilute your product for the sake of expansion. All things in time. I also agree that RIGHT NOW, there is not enough talent to go around to support 14 teams, and all of them be competitive. Hopefully THAT day is on the horizon, and will manifest itself soon.

We'll get there. Remember, the league began with only 8 teams in 1996. 25 years later, there's still breath left in that body.
On April 24, 1996, women’s basketball announced “We Got Next” as the NBA Board of Governors approved the concept of a
Women’s National Basketball Association (WNBA) to begin play in June 1997. The WNBA began with
eight teams: the Charlotte Sting, Cleveland Rockers, Houston Comets, and New York Liberty in the Eastern Conference; and the Los Angeles Sparks, Phoenix Mercury, Sacramento Monarchs, and Utah Starzz in the Western Conference. It's been a tough journey. Only 3 of the original 8 teams are still in existence. The Liberty, the Mercury and the Sparks.