Well I guess that depends very much on what you mean by being on life support. Like financially speaking? Oh yeah, they are more or less entirely dependent on Google. Regarding user numbers? Sure, Statcounter says 3.3% currently. Technologically speaking? Not really, quite the opposite actually. Besides Apples WebKit and Googles fork of it called Blink there is but one game in browser engine town, and its name is Gecko.