I see nothing of the "girls gone wild" variety antics in this video.
This is just harmless fun. Stef wearing a bee-hive (maybe two?) wig and being silly with her teammates will not hurt her in the WNBA, or any future employer beyond basketball. All of them are completely covered (Stef in a head to toe dalmation suit for goodness sake!), they aren't exposing their "female parts", engaging in any sort of sexual antics (Tiff giving a guy her phone number doesn't qualify!) they aren't in drunken stupor or playing any drinking games.
I think most of the girls are looking to go into a profession where creativity, and not taking yourself too seriously, is a bonus. The WNBA won't care, they only care if they can play basketball and have a "presence" that makes them and their team more marketable. Broadcasting, marketing, communications, and the like all value creativity. Now, if they want to go into some stuffy financial services group, it might be different.
This is just a little bit of silliness to relieve the monotony of spring break on campus getting ready for the tourney.
Now everyone join in: "Girls just want to have -un, oh girls just want to have fun".