No, your assumption is that it won't be rare, and I'm not sure what you base this on. Any marked increase in supply will be indicated by a wholesale spike in power-downs taking place, which would be quite easily identified seven days prior to the supply being put on the market.

True, short term rarity can never sustain long term. Fortunately, STEEM has far more fundamentals that lend itself to long term growth and sustainability in both price and user base.