i would say the block size should be doubled per 2 years
Why doubled? (seems like a large step)
And why per 2 years (seems like a long period to adjust) instead of doing so adaptively, according to current block size usage?
and the maximum would 256 mb
"640 KB should be enough for everyone"
even though if we could afford 1 Th HDD w/ $20 in 2020, every 4096 blocks would need another HDD again. that's doesn't at all qualify the sustainable development.
Not too long ago, 1 TB harddisks were unimaginable. A bit longer ago, but still quite recently, 1 GB was already *huge*. Storage space availability grows exponentially, as does bandwidth.
8 gb per block would be ridiculous for most of the newbies if they use the full node wallet.
8GB blocks sounds ridiculously huge
today, but 1 MB blocks would have sounds ridiculously huge 15-20 years ago.
There's no saying how futile a measly 8GB will be (in terms of either storage or data traffic) in 20-30 years from now.
Don't get too stuck up on the numbers. I hope the core devs can agree on a sustainable growth model, at least for the time being, rather than forcing Bitcoin to be split in Core and XT.