Strictly speaking it wasn't his, it was the originator of that thread, jgarzik, and satoshi replied "We can phase in a change later if we get closer to needing

Strictly speaking it wasn't his, it was the originator of that thread, jgarzik, and satoshi replied "We can phase in a change later if we get closer to needing it.", which doesn't strike me as a ringing endorsement. At any rate, the suggestion was for one increase, not an infinite sequence of increases, which your suggested exponential growth amounts to.