That is true, but the various parameters are somewhat arbitrary. There's no inherent reason that 64k blocksize is the 'right' right tradeoff and that 128k would be the 'wrong' one.
There seems to be an expectation that new accounts should cost somewhere in the $5-$20 range and that that should be sufficient for reasonable usage. A natural consequence of that is that as the STEEM price rises, the blocksize (and overall network capacity) has to scale along with it (not necessarily in lock-step though).
Good points, but I started to wonder why nobody has been proactively thinking about this? So I wrote a blogpost: From reactive politics to proactive politics (in blockchain governance)