That's a matter of opinion. I personally think that if the activity looked the same as it did 20 years ago, it would incredibly boring by now. And I find many of today's shows very exciting and moving - ESPECIALLY the pretty ("boring") shows that a lot of people seem to love to groan about. Whenever I think a show is just plain dull, I stop and think that SOMEONE had to be excited about it enough to design it.
...not to say that keeps me away from the concession stand. I'm sure 10 years from now when colorguard morphs into "performance art" that includes very little spinning or movement, however, I will groaning as well...lol