We have visited Sea World Orlando twice and Universal once. We enjoyed both, and hence our desire to do each of these parks again on our upcoming April trip. We have 6 days of park admission for our 8 day trip, and our two non-park days will be spent at these two parks, although we plan to be done at each by 5 PM or so, and spend the rest of the evening on WDW property.
I say all that to emphasize that I am not a Univeral basher or a Sea World basher by any means. But having said all that, I think Disney needs to stop viewing these places as competition. The reason I say that is that WDW is a full blown vacation all in itself. One can easily go to WDW and spend 10 days and never leave WDW property and have plenty to do for all 10 days, without even entering one of the four theme parks on all 10 of those days. You can shop at DTD, you can play golf, you can play mini-golf, go horseback riding, parasailing, go to a water park, or just enjoy the ammenities at your resort. Again, plenty to do on property for 10 days or more.
As much as Sea World and Universal have to offer, the same cannot be said of those two companies. With each one having a sister park of some description, one could easily stay on property at Universal or Sea World and have enough to keep them occupied for two, possibly three days, but after that, they're likely to get bored and seek entertainment elsewhere in the area. In general, people don't come to Orlando to vacation at Sea World or Universal. They come to Orlando to have a weeklong (or longer) vacation which may or may not be centered on WDW, and visit Sea World and/or Universal on one or two of those days. For the most part, these are one day parks which will be visited during a greater Disney vacation. But people generally don't struggle with deciding whether or not to do a Disney vacation or a Sea World (or Universal) vacation. They do a Disney vacation and take a day or two to visit these other places.
So Disney is in a totally different ballpark than Universal and Sea World. Disney is a vacation destination in itself while the other two are just daylong diversions within a longer vacation to Disney or the Orlando area in general.
For those reasons, I don't think Disney needs to see themselves as being in competition with Sea World...or even Universal.