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I recently read an article about a club doing this, They had a modular setup with basically three separate loops and wanted to be able to run each loop on either DC or DCC. They were going to use DPDT w/center off switches. Where the loops joined, it was suggested that a section between the two be isolated to prevent anything bridging a gap with DC on one side and Dcc on the other. If you simply wanted the whole layout to be able to change from one to the other, you could use the DPDT switch to change. When you get your DCC system, you can use the existing wiring. You just switch all of your blocks on so power is going to all of your track.
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