1) devs had these ideas before they started their business to promote their vision not other way round.
are you saying they were aware of the scaling problem years ago and did nothing to prevent it? That would explain why segwit is still not ready.
2) devs have many bitcoin so its in their interest for it to have best possible outcome for bitcoin
No, they do not. They have admitted as much. That is why they need another way to profit from their involvement with Bitcoin.
3) devs have history of providing open source and free work and being motivated by problems, ideas not money,
The same can be said of Gavin and Mike. and Jeff Garzik.
4) accusations of conflict of interest can be made at anybody like Gavin, Hearn, coinbase etc. The accusations are made selectively only against core devs who have different ideas to you.
Gavin did not need to take over core development. He was the only person with commit access and lead developer until he gave it to others. It is ludicrous to accuse him of attempting to steal something he already gave away. The same cannot be said for Maxwell and the Blockstreamers.
5) Most devs, and people opposing classic have nothing to do with blockstream.
If you are developing a product, you obviously don't want someone using a competing product, and so most core devs would obviously oppose that, but that is not the same as saying most core devs oppose a blocksize increase. That is simply untrue. Many core devs want an increase, but enough oppose it that, according to Wladimir's idea of "consensus" (which he apparently thinks means "near unanimity"), the smallblockers have effectively veto power.