2 MB can be achieved now with Bitcoin Unlimited. Bitcoin Classic will be released soon as well.
There's a Segwit test-net. Again, no experience with a 2 MB block size.
I do not think consensus is even necessary, this I know is a technical fact. Satoshi's vision is very relevant that does not mean he had to be right, I just happen to agree.
Then why are you trying to split the network in the sake of "decentralization" and underlying visions of nonsense? Fork off now and the market will move to the implementation if the economic majority agrees with you, will it not?
Based on what? Bitcoin unlimited is very much is in the spirit of decentralization. Bitcoin Classic can represent a community take over, reflecting the will of the economic majority.
Based on logic and common sense. Storing hundreds of GB of video and other useless data that nobody needs nor wants on their node is not going to centralize the network? I will be the first to exit the decentralization process shall that happen. Classic represents nothing but a bad attempt of a takeover.