"At first, most users would run network nodes, but as the n…
"At first, most users would run network nodes, but as the network grows beyond a certain point, it would be left more and more to specialists with server farms of specialized hardware." - Satoshi
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"It can be phased in, like:
if (blocknumber > 115000)
maxblocksize = largerlimit
When we're near the cutoff block number, I can put an alert to old versions to make sure they know they have to upgrade."
-Satoshi on block size increases