As far as improvements go, here are some of my ideas:
More flying enemies that are not wyverns or nature. Capcom, give us something like a giant Eagle to hunt and give the option to jump onto its back to wrestle it to the ground.
More detailed environments with more herbivore herds, birds cherping and bigger areas.
Bigger online rooms for bigger hunting parties.
Allow scars to form on your hunter's face and body.
How about instead of hunting and returning to a hub village, how about you, the hunter, travel across the world to various villages in each environment and hunt the particular monster(s) that plauge that village.
I would like to see a Megalodon-esque boss that could swallow Lagiacrus whole.
Besides eating food, the hunter can eat a particular monster's flesh and gain certain abilities called "monster spirits." For example, eating Lagi flesh gives you the ability to ward of thunder.
How about a carriage that holds a giant cannon or gatlin gun that the hunter, or his party, can use to hunt monsters. Sort of like a tank in the monster hunter universe.
Similar to the scars, the player has to suture wounds and splint broken bones thanks to injuries sustained by hunting the monsters.
How about blood hounds? The hunter could have some canine like reptilian creature that can sniff out monsters if their scent is given to the blood hound.
Ride certain animals for transportation and they can even help in battle.