--snip--
So yeah, that's another ~20 years without crossing 21 million BTC and I'm sure if I kept going, it's okay for some time, or possibly forever.
Actually, it will never cross 21 million BTC as long as the only thing changed is halving every 210.000 blocks happen forever rather than until the mining reward is 1 satoshi.
It's just like math problem/logic where if you sum 1/2, 1/4, 1/8, 1/16, ..., 1/2
n is less than 1