I don’t think there are many people who drop money on a new receiver every time a new standard comes out. The idea here is that when the time comes to upgrade—say, they update their TV to support Dolby Vision that requires latest HDMI standard—chances are they wouldn’t have to because the standard would already be supported.
Logic and the history of open-source software (OSS) also dictate that as a project gains popularity, more people tend to contribute, so hopefully, new standards would be adopted more quickly.