I'll never really understand why fans worry so much about demographics. So what if kids are or are not interested? As you say, you'll die and the kids will move on to something that does interest them.
Maybe instead of worrying about what's in the best interest for Paramount, CBS, or whatever entity stands to make a profit, people should just be interested in what they're interested in.
That said, I'd be interested in a Star Trek show that appeals to adults. An animated show could be that, but it's likely to skew more towards kids.