[mrb]

Then you will miss the moment when "Bitcoin has arrived".

You see, if anything the last 5 years has taught us, is that Bitcoin's adoption can continue to dramatically increase despite wild volatility. (Data point: Bitpay signed up 10,000 merchants through a period when 1 BTC was sometimes losing 50% of its value intra-day!)

Volatility is unfortunate, that's for sure, and it is expected to decline over time as trading volume increases. But if you want to measure Bitcoin's success/adoption, look at actual adoption, instead of volatility.

[grey-area]

Actual adoption as a currency requires pricing in that currency, that requires stability.

[mrb]

Then you will miss Bitcoin's success as payment processing, as a remittance (replacing Western Union, MoneyGram...), etc. Bitcoin is used more than just as a currency. Restricting your view to only its use as a currency is not seeing Bitcoin's success in these other areas.