I will say, I don't think it's a threat to take over Disney as the top place in the world, but I do think it could sway some folks to change plans. Not by itself, but for the people who think Potter looks cool, but doesn't think that is enough to justify spending almost the same money to go to Universal over Disney, this could push them over.
Now, from what you and others with knowledge say, they don't think that number will be nearly enough to justify a response. I have 0 reason to question what everyone is saying (just because I of course believe companies respond to others doesn't mean I think that always happens, or that WDW ever does). I do wonder if there is a number where there would be concern, or if they aren't even following Universal. I will say, 11 rides seems small, but it also does depend on what else they have. Are there other things like Meet and greets, shows, etc. If they have those things, the number of rides pretty much lines up with everything other than MK.
Everything said, I did think we would get a lot more from D23. Another crazy conspiracy, did they intentionally completely slight WDW just as a show of "Universal means so little to us, we will show absolutely NOTHING to combat." I doubt it, but no idea.