I really doubt you will see 2-strokes go away,they make way too much money from most of the pro motocrossers and racers and then not to mention all the people who jus enjoy the smell of two stroke exhaust. On the other hand 4-strokes have come such a long way with their technology that they have the power of a 2-stroke "but" they wont bogg down so much on a steep hill.:debil:
2-strokes wont go away. They'll just stop making them.:mad: . But RiDetILdETh, why wont a thumper bog down on a steep hill?. I take it you havent ridden one:p