White House officials believe Republicans have crossed the Rubicon on taxes, agreeing to — and indeed, proposed — significant revenue increases for the first time in two decades.

“It’s a sea change,” one senior official told BuzzFeed Monday before the final agreement was struck. “It will inevitably make it easier to get [Republicans] on board whenever we ask for new revenues, because they’ve already crossed that threshold.”

“That’s the legacy of this debate,” the official said of the bitter negotiations, which wrecked holiday plans across the capital and ended Obama’s first term on a bitter note…

“There is absolutely no appetite among Republicans to incorporate revenues in raising the debt ceiling,” said a Senate GOP aide, strongly doubting the party’s appetite for any more revenue.