1MB is dumb, just doubling it is dumb. I'd go for a linear progression as moores law would smash it but non the less something must change.
My proposal would be to:
- just accept Segwit in the following months (~1,7 MB)
- but guarantee the miners a block size doubling in 2018 (~3,4 MB), perhaps this is enough to convince enough miners for a compromise (that is approximately what the
Roundtable Consensus of 2016 said)
- and from 2019 adjust the maximal value by the average worldwide upstream bandwidth growth. That's about 10-20% per year - this estimation being based on
this document (already a little bit old, but should not have changed that much) which suggests a 10% yearly increase between 1980 and 2010 and then a slightly accelerating rate.