[pointsphere]

Yes, the number of coins in circulation decreases over time.

But the precision can be increased from the current 8 decimals. Even if all but 1 Satoshi/0.00000001 BTC is lost, it could still be split into smaller units, or used to bootstrap a chain with higher precision. It can be fixed as required.

Volatility decreases as the number of users and therefore liquidity increases. It should decline further with rising use of the network for payments instead of a pure store of value.

I agree that "viability as a payment system" is where Bitcoin is stuck right now, but scaling the system is the stated goal of all current Bitcoin developer groups. One of them will get it right eventually.