He didn't create the idea at all, it's been threatened before. And maybe remember that he first did it on non-Supreme Court nominations because the GOP had begun unprecedented use of the filibuster to completely prevent many Obama nominees from getting vote sessions. This was completely new and ridiculous stalling that was going to go unchecked for 4 years if they didn't do something to stop the GOP.
To call them Obama nominees doesn't even paint the whole picture. There is a practice where by a state's Senators put forth judicial nominees to the president, you had the GOP blocking the very people that they were recommending.