Yes, and Nintendo and Disney have some crossover, but people who love both will do both. The only real changes coming are where people choose to get their hotel (Universal has setup a better value proposition and better perks for resort guests at the moment), and how many days they choose to spend at each park.
The real danger for Disney is people choosing the Universal hotels over Disney's, and how many days Universal takes away from what was once a "trip to Disney". The sea change is coming where people do the trip to Orlando and primarily stay/visit Universal and are day guests to Disney, versus the current primary stay/visit to Disney and tack on a day or two at Universal. Disney could easily stave this off by building a bunch of new attractions across property and rebuilding/adjusting pricing on their hotels. The glorified motel rooms they currently offer at a higher price than some of Universal's family suites just aren't very appealing when the only real perk they get is direct transportation to the parks on overcrowded buses.
Either way, there is still more than enough business to support Disney and Universal.
The real danger for Disney is people choosing the Universal hotels over Disney's, and how many days Universal takes away from what was once a "trip to Disney". The sea change is coming where people do the trip to Orlando and primarily stay/visit Universal and are day guests to Disney, versus the current primary stay/visit to Disney and tack on a day or two at Universal. Disney could easily stave this off by building a bunch of new attractions across property and rebuilding/adjusting pricing on their hotels. The glorified motel rooms they currently offer at a higher price than some of Universal's family suites just aren't very appealing when the only real perk they get is direct transportation to the parks on overcrowded buses.
Either way, there is still more than enough business to support Disney and Universal.