Not likely. In order to survive the huge rents Disney wants, you need high-margin food and quick table turn-over. I think it's easier to mark up burgers and fries and surround it with dinosaurs to justify the price then to mark up filet and lobster and try to justify it--different target crowd. Those 12-and-unders are less discriminating. And higher end restaurants means longer meals, which means less turn-over.
Also, the "good" restaurants already in DTD are rarely packed. Adding, say, another half-dozen will just cannabalize the market further. DTD is not Restaurant Row (as TDO found out with the ill-conveived "PI 2.0" plan). For better or worse, WDW has decied to gear itself toward people with little kids and fanbois who are the reason over half the restaurants on property have some kind of burger/fries option.
If you really want good restaurants, you've outgrown WDW, it's time to start staying up by Sand Lake Road. Luckily, there happens to be a theme park up that way that a lot of people seem to rave about...