What they need to do is come up with one very large map bigger than all the rest that isn't so much of a map but a template that the game can use to create a map with the set dimensions using the biome of our choosing At some point before the game came out I kinda thought this would be the case with every map, I don't know why I thought that, but I liked the idea. If you found a map with a size and shape you liked you wouldn't be stuck playing in only one environment
I think the best solution would be a custom map designer using different settings.
Size: small/medium/large/giant.
Giant would not be available on previous gen consoles.
Mountains: none/few/average/many.
Water: none/rivers/lakes/rivers and lakes.
Biome selection with random as an option.
Dinosaurs on map. Choose from small/medium/large as well as herbivore/carnivore/Pterosaur. A tick in the box would choose one species from each selection at random that would be roaming freely.