I agree. In fact, I don't remember my exact age, but I was 10 or younger when I first went to Uni on a birthday trip. Me, my sister (who is a year younger than me), my cousin (who is my age), his sister (teenager at the time), their parents, my parents, and my pregnant step-neice all went together. While my neice didn't go on much and was only their for the afternoon, we all had a very enjoyable time and I went on everything USF had to offer. I loved it all and was thrilled when, two years later, I went again for a week in the summer and got to go to IoA. I think people underestimate Universal's family sellability. Part of the reason the parks are so special to me is because of this first experience. I was still a kid at the time, entering 5th grade, and it was one of the coolest trips I ever went on...
So I don't think Universal should be overly worried about making a 'everyone can ride' attraction. Could they add another omnimover? Absolutely. Will it make a major overall difference? I don't really think so.