For the few that can afford them. And to hell with the thousands of others who can't.
I can't see very many folks who could afford them who would want them - except for those noveau riche types who think something is luxurious in direct proportion to it's retail cost.
Maybe it's because I grew up around a lot of waterfront properties (both sea and fresh) but the main attraction of such is easy access to the water not just the view. Particularly when it's that close to water - it's difficult to say "look but don't touch". And, to be honest, that body of water is pretty stagnant and gross, not to mention the brain-cell eating killer bacteria that is under the slit at the bottom which prevents anyone from entering it to begin with.
That makes me think - I guess I haven't paid much attention, I thought they were going to be in a different area, not in the center of everything there. That's a lot of glass - what happens when some folks turn on the lights and have the curtains open and give the monorail riders a show. And how are they constructed? Is the whole thing floating or did they have to go down into that bed at the bottom? If they did, who knows what they stirred up. And how is potable water/waste water taken in and out?
I'm guessing that not only will they have railings, but I'm sure actual barriers that make sure that folks don't even sit down and dip their feet into the water. Disney can't risk that.
I have to say, in ways it's a clever idea - but I honestly can't believe it actually made it past blue sky. One of the things I always have found sad about the WDW resorts is that they don't take theming and uniqueness nearly far enough, something like this around a large wave pool or something might be cool - but in that stagnant water you can't touch? A big bucket of "huh?" from me on that one.