Yeah I agree... I like this idea in theory. But in practice I think you will end up with two major versions: "latest commercial version" and "latest GPL versio

Yeah I agree... I like this idea in theory. But in practice I think you will end up with two major versions: "latest commercial version" and "latest GPL version". And then people will want to patch the GPL version and not the latest. 3 years is a lot of delta... git is really good at applying patches, but I wouldn't want disincentivize massive refactorings.