The thing is, there are also people for whom the Tower of Terror is not their cup of tea. One of the best things about Disney World is that it has something for everyone, from small children to great-grandparents. For those who want non-stop excitement, you've got it. For those who want to see only the latest characters, you can find them, too. And for those of us who enjoy entertainment at a slower pace, in a style which actually hearkens back to a bygone time and place (which is, after all, what Frontierland is all about), for those of us who have an attention span longer than 5 minutes and who don't require pyrotechnics or laser light shows or interactive touchscreens in order to enjoy good music, we have things like the Country Bears.
Switching up the Country Bears for something newer, flashier and more watered-down in terms of a Frontier-era connection (an animated toy in a cowboy hat = American frontier, apparently?) would be a shame. It would homogenize the park's attractions instead of preserving their diversity, and throw away something perfectly good just for the sake of change.