To each his own obvioulsy, but my experience is different since I saw them live. In theory it's not my cup of tea, but I had the chance to see them live and it was the greatest show I've seen in a looonnng time. So in my case, not only the main course, but one of the most delicious meals I've had since I was young.^This.
It's one of those things that's cool for a while, and I certainly appreciate the skill, but for me this is more of a nice musical appetizer - it couldn't be the main course.
Like you and @Polfuste, I wonder how long will they last? Will they be able to renew their music?
Well, it's totally up to them — maybe they don't want to renew their style, maybe we'll forget them just as quickly as the hype took off. Time will tell.