I think Universal has a strategic pandemic benefit in their AP promotion earlier in the year when things were starting to look better and Disney was heavily limiting attendance. So they have built in a good chunk of people who have incentive already to go there repeatedly, which reduces the number of people either paying for tickets or APs at Disney somewhat. There are some like me who have passes to both, but I imagine this was a chance for many to try something else.
Now with these people getting used to going to Universal, they have the new park opening up, and that is it's own huge draw. Having the newest "thing" is going to be a big deal, especially considering that Nintendo World will be part of it. I can only hope that after Epic Universe opens that Disney follows up with some big additions of their own.