Market since 2009 seems to indicate many people do see Stevia as an alternative.
just as there are international studies showing aspartam is safe. far more than there is for Stevia. introducing stevia doesn't make aspartam any less of an alternative.
Equal (aspartame): down 23%
Sweet 'n Low (saccharin): down 26%
Splenda (sucralose): down 40%
Stevia (Steviol glycoside) : up 289% (and accelerating)