"under 1 BTC" means nothing if you don't account for bitcoins price. The 50, 25 and 12,5 BTC block rewards of the first epochs could buy a lot less than todays 6.25 BTC reward.
Unless you are assuming Bitcoin has already become a unit of account in the next few years its a bit speculative to assume 1 BTC will be worth less than 6,25 BTC now.