Not neccessarily so.
If you look at car and motorcycle engines, the HP per liter output is WAY higher today than it was just 15 years ago, and they use less fuel at the same time.
Eventually the direct injection tecnology will hit chainsaws ,too, and we'll really have a new generation of saws.
Have you run any of the little Stihl 4-stroke engines?
Those are SO much better for low end torque than the 2 cycle engines they replaced.
Not suitable for logging chainsaws, but my new polesaw sure outperforms the old one by far.
It is still in the interest of saw manufactorers to put out high performance saws, so guys like us will buy them.
We just need some designer to look outside the box.
Since Stihl isn't hampered by being owned by a vacuumcleaner factory, I look to them for new developements.