It would be a shame if such a great layout was demolished. Unfortunately, that's often what happens, especially since each home layout represents one person's unique vision.
Personally, I wouldn't pay a premium for a house with a layout - I would look at buying such a house as a win/win - buyer gets the layout, seller doesn't have the financial and psychological costs of demolishing it and hauling it away.
I think I found the neighborhood on Zillow. Didn't find a listing for that particular house, but it looks like houses on the golf course are listed for $300-450k. In that price range, it might be possible to find a well-heeled buyer who will pay a little more. And if the seller has to demolish it, the financial cost of doing so would be a very small percentage of the sale price.
Since the layout is of such high quality, I hope that the seller will resist the realtor's suggestion to tear it out.
Considering that the layout is located in an area of the country which has a high concentration of model railroaders, publicizing it to the various clubs, hobby shops, and train meets might turn up a buyer. The monthly meet in Wheaton isn't far from his location - maybe a nice brochure could be prepared and handed out, or perhaps buy a table and display the information.
