Fact of the matter is no matter what ( unless they are complete idiots...and that is open for debate) they would have to leave room to remove kilns and other pieces for maintenance or replacement......and the larger the processor, the more room needed.
What are they going to do ?
Disassemble #4 to work on #3 and replace worn items as large as a kiln just because there is a footprint large enough to possibly put another processor in that building ?
That would put both machines down.
There is more too it than just the footprint and fitting it in the building.
They need future access ( if there is a future...and that is open for debate) and that requires major amounts of room.