It shouldn't actually. Initially the prices will be naturally higher because it is a new product.
But from what I understand, to make a TV 3D glasses capable, you just have to manufacture it with a natively high refresh rate (about 120Hz).
The cost difference is actually close to negligible... so yea not a big deal.
And on the plus side, even if you don't give a flying fuck about 3D, you'll still benefit in the process with a higher refresh rate than you would have... so umm... hurrah for innovation.
Actually my cousin bought a 120Hz 22'' Viewsonic monitor a year ago, which at the time wasn't "3D capable". With a firmware update, it now is.
From what I read, you should see all these TVs be 3D ready in a year, and it won't cost you a dime, at least if you wait a few months.
However, there are 3D TVs that
will cost you, and these are the ones that still in development, and don't require 3D glasses.
Of course the problem with these TVs is that you are forced to watch everything in 3D.