ACMS,
There physically is no where around the museum to put it. Not unless they want to park it next to the threshold of Runway 03. Or put it well away from the museum.
The ground is not 'damn hard' either. They recently had to get a crane in to lift the nose of EBQ up so they could redo the concrete under the nose wheel, because it was sinking. Black soil country, just about anything will sink in it.
Personally I don't see what significance the 747-400 has over the 747-200. The -200 was the entry into the 'Jumbo' era, the -400 was simply just an upgrade.
morno