Perhaps, if you consider an idea first proposed by Adam Smith in The Wealth of Nations to be new. It is charged this is an untried idea. It is said it doesn't work. Perhaps, if you ignore the fact that nowhere has it been repealed after being introduced. At the very least it is continued, and often it is expanded.
Opponents often claim that there is no research supporting school choice.
Because they aren't aware of it doesn't mean it doesn't exist. Aside from the already indicated universal use and success of publicly funded choice around the world, you might note the work of Hofstra University Professor Mary Anne Raywid. She has studied school choice for more than 25 years. As long ago as the early 1980s she had more than 1200 examples, so many, in fact, that she could not process the data. So she asked the National Education Association if she could use their facilities and staff to do the computer runs.