The 1 MB blocksize limit limits how many poeple can use Bitcoin.
Wrong. Real usage has never pushed the 1MB blocksize. If there was real demand that was pushing the 1MB blocksize, things would be different. The only times 1MB blocksize has been somewhat pushed is by temporal and non real-use spam attacks.
well he is talking about real adoption , imagines with 1B people using bitcoin, do you really think that 1MB would suffice? sidechain is just a complex option for average people, i dunno if they could ever use it if a large % can not understand bitcoin yet...