I don't see any problem when others create their own fork of bitcoin, but given that the well-known developer of bitcoin is threatening to leave the github version to support another fork is alarming. Though we know that even if Gavin supported this fork and the network stays on mining the current fork, still there will be doubts among the general public seeing that one of the prominent figures in bitcoin leaves for another project. This would only drag bitcoin not only in price but also in adoption as well.
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the only thing that i am concerned with is if gavin brutalizes the github by revoking membership and preventing coders from continuing on with the current bitcoin code, forcing people to use hearns fork
This will cause a massive outrage from the community and the network that may result to a great loss. If ever Gavin did this thing, I think no one will ever trust bitcoin and its concept anymore. If he wants something to change in the code, he should consult the community and other developers as well, because first and foremost, he doesn't own anything in bitcoin's code; he's just another developer too of this great code, but only more widely-known by the community and the world, but still the fact remains that he's a developer and not the owner of bitcoin.
EDIT: Fixed some grammatical errors and spelling.