...
Wrong, wrong and more wrong.
The 1MB limit was put in place in 2010, not 2008. Actual bitcoin network upload speed (the real bottleneck) measurements show upload bandwidth for nodes at edge of network is growing at closer to 17-25%. (This disregards data caps for total bandwidth available also).
So you have made a case for 8 MB rather than 1 MB.
Check your math ... at the top-end 25%, 1.25^5 * 1MB = 3MB
Are you intentionally high-balling or your figures just always happily err on your side of the argument? (2008 =/= 2010, 50%=/=25%, 8MB=/=3MB, etc, etc).
The rest of your non-arguments about
your residential connection is one ad-hoc data point and the stuff about chinese vertical integration of ASIC (lolwtf?) is simply pure speculation. Decentralisation will be seriously challenged by bigger blocks, it is already and the data points to that not getting any better any time soon.