http://www.sbnation.com/soccer/2011/9/19/2435544/don-garber-100-million-mls-expansion
The rumor was that rich investment groups from the Gulf are interested in a NY franchise. 2016 will likely see 20 teams. Hopefully New England and D.C get stadium projects going as well.
Well, I suppose it may be the price tag he's placed but I would be surprised if they got that much if/when the second NYC team happens. Their best bet will be if PSG or Man City go ahead and form a club as has been rumored.
Either way, that is a fee that will not fly outside of NY -- not until the MLS is making more from broadcast rights. The biggest European clubs are lucky to make a profit at all.. expecting an MLS team to make back $100m in any reasonable amount of time is ludicrous.