I've heard rumblings for awhile that Indy V (If it happens) is more of a swan song for the old guard (Ford, Spielberg, Lucas, Williams) and that after the fact Disney will do a proper reboot with a new cast in films, cartoons, comics, video games, etc. If so then I could see the logic of doing a smaller 'Celebration of Indiana Jones' to coincide with Indy V and then do an actual Land with rides once the new series is up and running.