My ideas....since Disney is spending so much money on DL for ToT, Bugs Land, and all the 50th anniversery hoopla, this is what i think should happen WDW-wise:
2002 - Dinorama, Journey Into Imagination
2003 - Mission: Space, PhillharMagic
2006 - (35th anniversary) Aquatopia (from DisneySeas) in the 20,000 Leagues lagoon, and Beastly Kingdom in Animal Kingdom, with Dragon coaster, and another e-ticket
between 2004 and 2010 - Various minor additions....maybe a new e-ticket for Magic Kingdom, possible changing of Movie Ride and Star Tours in MGM, some sort of minor Epcot improvement (Storm Riders), and/or Australia, or some other addition to AK. Maybe nothing
2011 - (Huge year, 40th anniversary) 5th gate opening as.....DisneySeas!! (oh God im PRAYING this happens) with Indiana Jones ride, Journey to Center, "Soaring Over..." ride, Voyage of Sinbad (looks amazing) and some original rides, but with basic "seas" intact, and fantastic theming.....
i hope at least some of this happens, but PLEASE let the 5th gate be DisneySeas...i have a feeling the next gate will be open within 10 years