When the rumor was shared WDI was trying to choose between MILF and SGE. Since The former had its signage refreshed recently, if the exhibit is going forward, it would be there.
I also remember hearing that on top of this Merchant of Venus wouldn't be reopening and that there were permits filed to do some work in there, which could potentially support this.
When Disneyland had it's 50th anniversary, one of the best things they did was turn the Main Street Opera House into a Disneyland nostalgia gallery leading into a short film starring Steve Martin and Donald Duck, talking about the park's history (while giving Great Moments with Mr. Lincoln an update behind the screen for when he'd return.) I'd love to see SGE get the same treatment here somehow. Showcase models of Cinderella Castle and a few major attractions, original artwork from WED, anything that could wow. Perhaps there's another famous former CM from WDW that could host a film for this one? Thankfully Disney literally already has a theater right there, though being in the round might pose a challenge. Then Merchant of Venus could then turn into a shop housing retro WDW merchandise specifically designed for the 50th.
So...that's what I'm hoping for ^_^