Well, we'll see what happens with Harrisburg after last fall's flood, but an SF / Nats swap of affiliates might make sense. I don't think either is important to SF's fan base, and I think Harrisburg is almost as accessible to west coast via Dulles and BWI as Richmond is. Not much coast to coast from Richmond, I'd imagine?
Maybe the smart call is to concede I-83 to Bal'mer and build a fanbase on I-95 / I-66 in VA. I don't think you should bother with Delmarva and VaBeach too much in terms of displacing the Os there. The Os likely will fight. Relocate the P-Nats to someplace along I-66 or maybe Charlottesville, move h-burg to Richmond, and keep the Suns either in Hagerstown or in Winchester.