Voices: TLS Fallbacks are Dead
Eric Lawrence gave an overview of the current state of TLS version
intolerance and browser fallbacks, https://textslashplain.com/2016/05/04/tls-fallbacks-are-dead/
Currently, looks like the major players of browsers don't support version fallback any more:
Safari: Not support
IE: Not support
Firefox: Removed in Firefox 37.
Chrome: Removed in Chrome 50
Opera: Remove in Opera 37
Version fallback is a legacy mechanism for version negotiation implementation bugs. With the fading out of version fallback mechanism, it may be not necessary to support TLS_FALLBACK_SCSV if it is not actually used in the real world.