Maybe not, something has just occurred to me. If Frodo, Sam, Merry and Pippin had just returned to the shire and all was normal, it is quite possible that no-one would have heard of their exploits and they would not have believed what they had achieved, at least with this ending they are able to demonstrate their courage and strength in defeating Saruman to regain the Shire for the Hobbits and to then hold positions of respect that they deserved among their own peoples.
Hey I just thought of all that myself, I may not be as dumb as I look after all.