OK, I am going to preface and say that there is like a <1% of Disney moving an attraction at any point in the near future. It's extremely unlikely to a point of it being clear that it just won't happen. So, this is really an academic discussion, not one about realistic possibilities.
If it already exists though, what is the point? Just wasting money to waste money? Isn't there already a $2 billion project doing that?
I would agree that it doesn't make much sense to spend money to move an attraction (and thus have a net gain of zero attractions) as opposed to putting money towards a new attraction (and thus have a net increase of attractions). If an attraction were to be moved in our current age, the motivation would almost certainly revolve around the locations that is being vacated than the future destination. IOW, the main reason I could see an attraction being moved is because there is a reason to want to remove it from the current space for other development and the attraction is viewed as something worth keeping. A ride is not going to be moved just because it "makes sense" somewhere else.
As an aside, it should be noted that TDL is moving IASW in the new future, so it's not true to just say that attractions will never be moved again. There just has to be a compelling reason to justify the cost. Also, it's worth considering that some attractions are cheaper and easier to move which would factor into any decision. Moving a movie or show would likely be more realistic than a ride.
That said, there are certain attractions that get mentioned to be moved somewhat regularly: CoP, Laugh Floor, IASW. Some on this thread have talked about Buzz too.
CoP isn't getting moved. The only logic behind moving it is that it would be a "better fit" in Future World. I find that pretty weak on the surface and it's not exactly the type of attraction that Epcot is hurting for. Furthermore, it's not like MK has a practical need to move the attraction -- it's not blocking any access to anything, even the backstage parking area. Removing it doesn't create any more opportunities that don't already exist in TL save for the physical space occupied by CoP itself and TL already has multiple expansion pads sitting unused.
Buzz has been talked about in this thread and it's another one that makes no sense IMHO. It's not a poor thematic fit for TL (at least it's nominally about sci-fi stuff), it's popular and it's relatively unique for MK as a shooter ride. Moving it to DHS, the only other park with a shooter ride, seems pointless. There's no particular need for that space in TL, since as mentioned there are existing expansion pads.
Laugh Floor could theoretically be moved. On the one hand, it would be easy/cheap to move unlike a ride (if they moved it into the vacant Premiere Theater, the costs would be fairly minimal since it's an existing structure). Secondly, it is a terrible thematic fit for TL and would be better for DHS were it to be moved there. But the real question would be was is the benefit? The only reason I could see it being moved is if Disney had specific plans to use the Laugh Floor footprint
and the large expansion pad behind the building (currently used for parking) for a new large E-ticket. I view that as something that could be plausible since we'd be talking about a relatively small cost for the move, but I still don't see it.
IASW is the most curious case IMHO. On one hand it's a FL staple and is an opening day attraction. Also, it's would be costly to move. On the other hand, you can make an argument it is a better fit in World Showcase (or you can argue it wouldn't be, depending on your prospective) than FL and that it is the type of attraction that Epcot needs to be rounded out. But the biggest argument in favor of IASW moving has nothing to do with IASW and has everything to do with its location -- it's in a choke point of a location and it is blocking potential expansion space to the north. Moving the ride would enable Disney to demo the building and have access to a lot of space. That's actually a realistic justification for moving an attraction. So, while I don't think it will happen any time soon, it's at least arguable that at some point Disney might have expansion plans which would make moving IASW a necessary and sensible idea.
Again, however, this is all just hypothetical talk and anyone expecting rides to move are just setting themselves up for disappointment.
