I don't think the question is whether or not TDO is worried about the construction. They'd only be worried about what effect it would have on the business at WDW. Considering how packed the parks are, and how there practically is no such thing as an off-season any more, that's a tricky proposition. Ultimately, new attractions are supposed to bring bodies into the park, but if the park is always packed, where's the motivation? There are philosophical questions about quality and variety, but in the end, the powers that be look at the numbers. If the numbers are satisfactory, they have little motivation to act. Now, if one of the Universal parks over takes attendance at a WDW park, I would imagine it would only concern Disney if that park's attendance has decreased.
Based on my extensive visits to the parks, I don't think Disney is all that concerned with increasing attendance, they're doing ok in that regard. Instead, it doesn't surprise me that Disney is looking for ways to increase per Guest spending. I feel like there's a "sweet spot" where you need to balance attendance versus the guest experience. If every day was like NYE, there wouldn't be many happy guests. I'm actually debating whether I want to renew my AP to Universal this year, once HP2 opens, my fear is that the parks will constantly be way too busy to enjoy. I tend to visit Universal a lot lately, but that's always been because I've found the lines are consistently shorter and the parks less crowded than WDWs. If that changes, I'm not sure what I'll choose to do. Seems sort of counter intuitive, surprised me for sure.
I still don't think MyMagic+ is a bad idea, however, I certainly think aspects of FastPass+ are not practical. I, for one, will not be surprised once Universal introduces their own wristbands.