I don't think so. NY is sold out pretty much every year. Plus the NY brand is also already out there. There might be an increase in revenue but NY won't get as much. Markets like Tampa Bay would feel the effect much more. i think the NY Yankee brand is pretty much maxed out right now in terms of revenue.
The Yankees are where they are because Steinbrenner continually reinvested his own personal money into the team. Does the Twins owner do that? No, he's a billionaire who gets a revenue sharing check from George which promptly goes into his pockets. How about the KC owner?
The Yankees floundered in the late 80's and early 90's. being in a big market doesn't guarantee anything except a larger potential audience and fanbase. It's always up to the individual owners of the team and their dedication to the success of the organization. If the Yankees revenue stream suddenly went belly up for no reason, I'm sure George would invest his own personal money into the team to keep it a success.
Another example. Consider how much the Yankees are paying for the new stadium out of their own pockets ($800 million), then consider how many owners beg their states or cities to foot the whole bill. George is willing to put al his money on the table for the success of his team. If the small market owners had this mentality, maybe we wouldn't be dealing with this right now.
last point. How good do you feeel knowing that part of the 100 bux you just spent on a ticket, 2 hot dogs, 2 beers, and a parking pass is actually going to the pockets of a millionaire who doesn't care about putting money into the team?