Why not?
I have a few opinions on your post:
Don't worry. They'll get lighter.
This is irrelevant. Folks were afraid of fuel injected cars 20yrs ago.
Can't argue this.
In about 10-15yrs someone's going to build a 50-60cc 4 stroke saw that turns 11k rpm reliably.
The 2 stroke is a dying breed. As the years go by, there are fewer and fewer 2 stroke engines available. Look a watercraft, snowmobiles, motorcycles, lawn mowers, weed whackers, leaf blowers. Chainsaws are the last of it and I don't believe they'll hold out forever.
I explained why not in an earlier post. You provide counter arguments to the negatives, but fail to explain why 4-strokes will take over the chainsaw market.