What's Up With the Ending?
King George VI made Lionel Logue a Commander of the Royal Victorian Order in 1944. This high honour from a grateful King made Lionel part of the only order of chivalry that specifically rewards acts of personal service to the Monarch. Lionel was with the King for every wartime speech. Through his broadcasts, George VI became a symbol of national resistance. Lionel and Bertie remained friends for the rest of their lives.
The end of the movie is about as heartwarming as it gets. True, Bertie hasn't exactly cured his speech impediment. If anything, he has learned to live with it in a more constructive way.
But the most important thing is that he has learned to trust Lionel Logue, and that he will go on to inspire his country to win World War Two. It's nice to know that Logue went on to get the recognition he deserved and that he and Bertie would remain good friends.
After all, we've seen them go through so much together that it would be a bit of a rip-off if the final disclaimer said, "Bertie fired Logue three weeks after his speech impediment was cured. His final words to Logue were 'What have you done for me lately?'"