Second, I can only agree that this does no more than provide an opportunity for the Dems. It's still possible -- even likely -- that November 8th will find them firmly in the minority.
Finally, if the GOP does manage to lose its majority this year (which, honestly, would probably require them to give it away with both hands), it couldn't happen to a nicer party. After all, as has been widely observed, it is only in the minority that Republicans in Congress have any detectable small-government principles. Once in power, they're drunk on spending as much as the crypto-socialists they once railed against.