Unless the surrounding soundstages are also demolished, I don't see this concept happening anytime soon.
The current tram loading station is large, and has enough road to allow for multiple tram backups on a large lane (plus dual loading and unloading zones). If the surrounding stages were to remain, trams would simply congest that stretch of studio road that runs parallel to the Jurassic Park queue. That's a major lane for studio production, and I don't think they'd want to congest it more so than it already is. Plus, you have that pesky fire lane that needs to be cleared...
If they were to move the Studio Tour back to the Lower Lot, I don't see why they wouldn't move it to its original location underneath the StarWay. Replacing Soundstage 28 with a the new Studio Tour entrance seems like a waste, and I'm not sure the park is willing to make that sort of tradeoff. If anything, Soundstage 28 could be the new entryway for an expanded parcel of land for the Lower Lot.