No, it wouldn't. Even if it was just RSR (or an indoor verion with similar capacity) this is what it would look like:
RSR - 1500/hour capacity.
On the average 9-10 day at DHS, that equate to 19,500, which is 9,500 MORE than if LMA completely packs both shows (which it never does). That's assuming there would only be one ride too. Say they add whatever the new Luigi's ride is. I wanted to use Dumbo as an example since it's a carnival ride with pretty crap capacity. If they went the route of Dumbo at MK and doubled, it may come close to 1200, if not then around 600. So...
RSR - 1500/hour = 19,500
Potential Luigi ride with hypothetical 600/hour = 7,800
Potential Luigi ride (doubled) with hypothetical 1200/hour = 15,600
So I don't see how it's a subtraction. Before you even add in the capacity of walking space, shops and restaurants, we're at anywhere from
27,300-35,100 per day as opposed to 10,000 on a great day.