Satoshi was being realistic about its own design unlike all of you small blockists who didn't had the genius to invent bitcoin. He obviously wasn't locked up in a prison of fear.
The conditions under which Satoshi himself established a block size limit, remain today.
The conditions today are very different to when Satoshi established the blocksize limit, and they will continue to change. Keep in mind that the one megabyte blocksize limit was always just intended as a temporary measure.