Let's say that 700 million people use Bitcoin (that's ~10% of the World population, even less), and that they all make only 1 transaction per day. Transaction size is averaging half a kilobyte today (source Bitcoin Wiki).
700 million transactions * 0.5 = 350 million Kilobyte = ~350 GB/ 144 (blocks per day) = ~2.4 Gigabyte per block. This is only if they make a single transaction per day (which is unlikely, as the average would be much higher with adoption on this scale).
350x365 = 127 750 GB per year (i.e. 127 TB). This can be avoided with the second layer.
pulling random numbers out of your ass,,(700mill users, 1 tx a day) where did you even get these numbers from
your putting a utopian dream of 20+ years time, to try defending blockstreams greed of 2016 decisions.. really!
your numbers have nothing to do with any possible reality of 2016-2018, get a grip
the debate for the next 2 years is basically 2mb+segwit (approx 4mb capacity emulation)
currently 1mb allows 2000 tx(average) a block. 144 blocks a day.
thats basically acting as if 288,000 transactions a day.. you can interpret it as only 288,000 doing 1 transaction a day or 2million people making a transaction every 7 days.
with 2mb. thats upto 576,000 tx a day potential.
with 2mb segwit. its initially 1million tx a day, and then downplayed to 500,000 once things like payment codes and other added variables/constants added to the tx.
with 1mb segwit its initially 500,000 tx a day and then downplayed to 250,000 once things like payment codes and other added variables/constants added to the tx.