Honestly I could see MLS2 failing. Most major cities without an MLS team either have an USL team that's either well established or being established.
The same issues facing MLS2 are facing the USL. Does MLS really want to dump a ton of money into building SSS? Well they can afford the advertising would that attract new fans?
Will they put a quality product on the field?
To many unknown's for the MLS. This ain't going to happen.