Price stagnation is close to impossible from happening because an active market will always have a fluctuation no matter how stable we declare it is, look at forex, the prices there are stable but the prices are still moving up and down because there's an activity in the market for them, I think a market will only stagnate when no one trades there so basically the market of that is already in shambles. Yes bitcoin's volatility is more of an advantage than disadvantage because the volatility makes it fair for everyone in the market and that anyone can still get in even if the price of bitcoin goes up but since there's volatility, they get to get in at lower prices.