Vista is finally getting out of the market in April 2018, 12 years after its introduction. Windows Vista was made to replace Windows XP, and we have come full circle as both XP and Vista are retired, with Windows 7,8 and 10 ruling the space.
To be honest Vista was never a great success and many of the younger newer Web users may not even have heard of it.
This is the nature of the operating system business, as Windows has kept introducing new versions and editions of its OS, always adding more sophistication, security and features. In this fast evolving context the older editions are retired, but they were helpful in shaping what runs our Windows platforms today.