so what? You realize that CS 1.6 lasted from 1999 to 2011 right? And source kind of split the community but the majority of the hardcore players stayed on 1.6.
So now that there is money and an economy on the line which valve basically makes so much money off of, I doubt that they would just remove them all together if they do make a game in 6 years, but that is pretty short since 1.6 started to decay around 2010-2011