Sure... fair enough that you described your perception of what the interests are here, yet I don't agree that you are reflecting it accurately when you suggest that coinbase is aiming for decentralized bitcoin and that somehow blockstream is in control of core's direction.

I personally see the current situation as classic, xt, coinbase and other advocates of change failing to meet their burdens of evidence and/or persuasion and therefore, core sticks with the status quo.  At the same time the advocates of classic, xt and coinbase etc are very vocal and emotional about the lack of change because they believe that they have sufficiently met the burden of evidence and/or persuasion... or that being louder is going to carry some weight in the decision making regarding change or future direction of bitcoin etc. 

There is no ruling out future changes so long as any such proposed changes are presented as convincing to a large majority of the stakeholders in order to test and adopt the changes.  At this point, no one is really controlling bitcoin.. it remains decentralized, and the fact that neither xt or classic were implemented helps to show that it remains decentralized.. sure at some point some version of various aspects of each xt and/or classic may be incorporated.. just like seg wit is currently in the works.  whether it is blockstream, coinbase or any other company, they will need to work around these anticipated directions, and I am repeating that I am pulling a lot of my money out of coinbase because I continue to perceive that they are continuing to be too pushy in the space in their efforts to achieve consensus by stick rather than carrot... or maybe just having less activism from Coinbase would be more appealing to me under these current circumstances.