Two Stroke Four Stroke... You Are Missing The Point!
It is just a matter of time both will be gone. Just look at the automotive industry. Only highly efficient computer controlled, low emission models remain. Hybrid models are taking hold, like it or not. It is not about power or weight, it is about our so called dependence on foreign oil, and the depletion of our ozone. Why do you think the costs of petroleum based products are skyrocketing? It is not to make the big oil co. richer, like they would like you to believe, but to bring the price more into line with alternative power. The closer the price the easier it is to swallow "the pill". Higher maintenance costs, more expensive power source, heavy, computer controlled, limited ranged, and no power.
I am a mechanic, I have been one in the automotive industry, for over 18 years. It is next to impossible to keep up with "advances" in the industry. The average 16 year old does not stand a chance. Some of the simple tasks have become time consuming and labor intensive. Who pays the price? You the consumer, of course. It is a simple theory, it's called the trickle down effect.
The tree huggers are winning, and there is not a lot we can do about it. We may delay the outcome, but win we will not. So either band together to stop or at least delay the ultimate result, or get out your electric scooter charged by your computer controlled wind generator. Want to talk maintenance costs of that little gem?