I know that there are those die hard two stroke fans but I believe you will see not only Stihl but other manufacturers going the way of the 4 mix engines and I also believe you will see the hedge trimmers, chainsaws, and handheld blowers going 4mix in the near future. I think probably Stihl started with there most popular or most used piece's of equipment first to see how they would do in the market. I've said for a long time that the two stroke stuff will eventually be phased out. I know that people think I'm crazy and they say it will never happen, they said the same thing about outboard motors too but it happened.