Thinking about this a little more, I rather wish they took a different approach than actually
replacing The British Invasion:
I'm not sure quite how they could have accomplished this, but I feel that
location is a problem, here; specifically that Canada is too close to England. Sometimes I felt, when both bands were performing, that the whole afternoon was essentially "too noisy" in that portion of the park. It just seemed too programmed to me, and I'd rather have had one band, performing for 15-20 minutes per hour, and leave the rest of the time with the background music.
In the end, I'd have rather seen Disney use The British Invasion's retirement as an opportunity to establish an ongoing pop music band presence elsewhere in the World Showcase, somewhere "not close to" either Canada or Morocco (where there is another ongoing rock band presence, in Mo'Rockin). Besides addressing my location issue, it would also mean we'd get something we haven't had before, which is always a good thing, instead of a second instance of something we have had before, which may or may not pale by comparison. (I can just see the first few posts after the new band starts performing: "They're not as good as The British Invasion." I'm sure we'll see that from some folks even if the new band is better.

)
Like I said I'm not sure quite how they could have accomplished this, because the choices would end up being Italy, Germany, China, Norway and Mexico. While all these countries obviously have their own, current pop music, replacing The British Invasion would necessarily involve music that the predominantly American audience would recognize as such. Germany perhaps could do it, but quite frankly, Americans don't think of Germany when they think about pop music. There have been a handful of cross-overs, but not many - nothing like England or Canada.
Mexico actually would have been a great idea, imho, from the standpoint of pop music. They could have gotten a band that covered songs by Mana, Gloria Trevi, and Latin popular music from the 1990s and 2000s. There have been loads of cross-overs over the years, and Latin popular music has very substantially affected the popular music of the United States.
Unfortunately, there really isn't enough space in Mexico (anymore) for a big crowd, that a band like that would attract. The space where Mariachi Cobre performs is okay for the novelty of traditional music, but it wouldn't be large enough as a pop music venue.