Building a brand.
I think that putting some big bucks into the attraction is a positive step.... not because of the "Disney dweebs," but because of building the Disney brand.
Disney theme parks are #1 for a reason.  You can go to other parks to see popular characters and ride rides.  But Disney is known for always putting the extra money, time, and effort into what they do, creating the small details that your average guest wouldn't notice but that ultimately build brand loyalty and make repeat visits fun.
Give your guests a phenomenal experience on an attraction, and they'll remember it and tell their friends about it.
Give them a poor experience and they'll remember that too.
Your average guest has no idea who Dreamfinder is and probably isn't even aware that there was ever an earlier version of JII.  But they do ride the current ride and come off going, "ho hum."  It's a letdown of a ride, especially for something with as bold a concept as IMAGINATION.
Just think... imagination!  So many things can be imagined, and if any attraction in all four parks should blow people away, it should be one about imagination.  With imagination, you're not tied into an existing storyline, and you're not confined by anything other than what is possible to build.
Disney's strength has always been in innovation.  That's what the imagineers are known for.  The biggest successes of today are the attractions that use technology to give us something we've never seen and draw us in in innovative ways.  Think Turtle Talk - simple concept, but it has appeal for all ages, and people are amazed by it.
Let the imagineers run wild on Imagination, and it could be a family-friendly must-see to offset the thrill rides like M:S and Test Track and the adult-oriented World Showcase.  Besides, Epcot may not be most in need of a new attraction right now, but with several attractions showing their age, it's only a matter of time, and it would be good to stay ahead of the trend.
I have no personal attachment to Dreamfinder, but I would like to see a really cool attraction for all ages in the Imagination pavilion.  HISTA isn't going to hold out forever.
-p.b. 
