Even if they redo all the facades in Fantasyland there will still be disconnect of some kind due to the way the castle dictates the overall look of the land. When I see the new Tangled area (or Belle's Village), I'm reminded of the look of DLP's Fantasyland with it's "storybook" architecture of bent cureves, saturated colours and rich detail. This means the area itself looks great, but doesn't entirely "fit" with the rest of the land which uses more realistic angles, colours and frames for its buildings. MK's Fantasyland is (or was) about making "fantasy" real by increasing the number of turrents, slanted roofs and towers to exagerate reality, similar to how Main Street has a superfluous amounts of gingerbread detail, but still is grounded in real world architetural influence. Note the original earthy colours in the first photo which were replaced with candy blues in many cases in an (unsuccessful, IMO) way to make it more "fantasy-ish":
DLP and DL's Fantasyland have a more "storybook" look, that tries far les to replicate reality in some form, but exagerate the elements of design further to create an even more fantastic look, the Castle in DLP, reflects this too, in an effort to differentiate the land's appearence from real European villages a short drive or train ride away:
It's actually good that the Castle Walls exist as they not only provide a themeatic transition, but help to visually seperate the "old" and "new" Fantasylands, so that the difference is less obvious.
It will be interesting to see how much of the original Fantasyland is changed in the future, but I would hope that enough of the old design is retained to create a smooth transition from one look to another. Plus I actually like the look of the area right behind the Castle as is.