It seems that what you (and a lot of others) are missing is that it wasn't meant as a temporary decoration. It was meant to be there for the long term, and was built as such. If they were building it to only be there for an 18 month celebration, they would have just attached it to the geosphere's structure, and not built an elaborate substructure for the wand.
To put it another way: You don't build a foundation that is meant to last in the extremely long term (decades) for something you are only putting up for a couple of years.
I agree--My gut tells me that it will stay, but there are some compelling arguments for thinking it MIGHT come down. First, there is a major management shift, both high-up and at the park level. The changes that we have seen recently (project tomorrow, SSE referb, WS restaurant referb/remodels, possible new Canada movie) point to a new direction for EPCOT--a sort of return to its original concept. You can bet that if Lassiter says "take it down," it will be done.
Also, the wand has not been up for "a few years"--more like eight. I am almost certain was put up BEFORE the year 2000. While this is not the decades you mention, there have been many so-called "permanent" attractions/structures that have not lasted as long at WDW. The people responsible for the decision were the same people who put up the birthday cake castle--and they originally said that the wand would be temporary, just like the pepto-cake castle.
Lastly, I would seriously doubt that it would be possible to attach anything substantial to the structure of the sphere, even if they wanted to. Without an engineering degree, I am not really qualified to say too much about this, but I am pretty sure that most of the main structural support of SE is internal--the outer layer can only support itself.
Besides, what would we post on these rumor boards if we all resolved that it would stay for a long time?
Oh, I forgot, we would probably have more threads about monorail expansion.:hammer: