dont believe all that you hear.....It seems you have not been looking at KTM or Husqvarna....both still making very advanced 2 stroke.....Im actualy finding myself very interested in one of them.
If im not mistaken, Yamaha is still making the yz250
and then there is the snowmobile world along with the jet skis and the marine world too.....plenty of four strokes in the lineups but the the 2 strokes are still amongst the highest performance machines.
as great as the modern 4 stroke is these days, its gonna take years more R&D to overcome the flat out simplicity, reliablity and power to size and weight ratio that still cannot be matched. if at all possible.....braaap !