I don't want to derail this thread any further, but I still get the impression a lot of the very bold pronouncements about Disney losing their customer base or, in this case, entire generations are backed more by general impressions or opinions than anything else.
The point I was making related to the idea that Orlando was a mature market, ie. that it had low growth potential. So, what I was saying was exactly what you are suggesting here is happening between Disney and Universal, that is that Universal's growth is largely coming at Disney's expense. I don't, by the way, think this is necessarily true.
The broader point, though, was whether we are indeed seeing what you assert we are currently seeing, ie. a drift of customers from Disney to Universal. I'm sure in individual cases that is true and may be so for some demographics, but I keep hearing this and then see quarterly reports from both companies that don't tell the same story. I would certainly be happy for Universal to be putting pressure on Disney in terms of price and experience. However, I do wonder whether this is largely wishful thinking from fans.
If, alternatively, Universal is mostly growing the market by either attracting people who otherwise wouldn't have gone to Orlando, including families that have tired or been priced out of WDW, that is likely a net positive for both companies. From Disney's perspective, they may at least get a day or two of vacations from visitors from which they previously would have received zero.