Personally, I think Avatarland will be as good (or better) fit into AK then Dinoland. It will also help Dinoland blend in better with AK. The reality of AK is that you:
1 - Enter into AK through a beautifully done jungle pathway with animals all around;
2 - Get to the centre, the Tree of Life which has a nice bug/cartoon tie-in;
3 - Branch out to a village in Africa which is modelled on an existing village;
4 - Check out Asia which is also pretty much in current timeframe;
5 - Then <hiccup> you're in Dinoland ... however gorgeously done, everything else in AK is representative of today.
Currently Dinoland, because it doesn't match timelines, makes the whole park look fake. The "county fair" part of it just enhances this. Adding in a futuristic land will help balance things out and make Dinoland fit in better.
Also, with it's very strong themes of nature and conservation, Avatarland blends in very nicely. Afterall, the vast majority of the movie is about nature, not spaceships and future tech.