The Centralization Issue of Scaling Bitcoin Solely by Block Size Increase

A block size increase from 1 MB to 2 MB or even to 8 MB will likely not lead to the occurence of severe technical issues that could negatively affect the bitcoin blockchain in the long-term.
But, as bitcoin and security expert Andreas Antonopoulos explained at the ‘Bitcoins in Bali’ meetup on June 27th 2017, if the block size gets increased in orders of magnitude at a rate that is proportional to the increase in the user base, a difficult problem will inevitably emerge, wherein bitco