SegWit is usefull and Bitcoin Core should start cooperate with Bitcoin Classic to get both activated, SegWit and BIP109. Without this, both activations will be much more difficult

Cooperate with a high school science project? Interesting suggestion. A combination of both would be too much and BIP109 is really useless with its added limitations (a 2 MB block size limit without those is better).
Did it increase by tenfold in 5 years? Not even close. Satoshi did not have the adequate data here.
There is a lot of processing power being untapped right now. This is typically found in GPUs though:
The max radeon single card (not a 2x) of 2008 was, the 4870 doing
1.2 TFLOP (single) / 0.24 TFLOP (double) / 115gb/s ram
The max radeon single card (not a 2x) of 2015 was R9 Fury 9 doing:
8.6 TFLOP (single) / 0.53 TFLOP (double) / 512 gb/s ram
Two things: 1) I didn't ask for GPUs; 2) Still not tenfold.
You didn't logic it correctlly. the block size limit was used to protect against "poison" blocks. The block size limit is in the way of natural growth.
There's nothing natural about it.
A different solution to "poison" blocks exists now so block size limit is redundant. Segwit has nothing to do with any of this
It isn't a solution. It is a workaround that prevents certain types of transactions.
You are a great example. You studied, you did your math, you weighed in all sides. Even more, you really tried to side with Bitcoin Core and understand them as much as possible. In the end you made your choice. This is a great example of Bitcoin freedom of choice. .
1) He certainly didn't "study" enough and is unaware of a lot of things (e.g. Segwit benefits).
2) The math is high school level and provides inadequate data.
3) It is freedom of choice as long as one sides with Classic, right? Nonsense. Wake me up when the project gets real developers. Seems switching people over was easier than I thought.
Jeff and Gavin are fake developers. Luke Jr. is real. Check.