A few humble thoughts...

First, I think with time BTC volatility will settle down.  We're about to enter a derivatives BTC market for the first time which will level out the peaks and valleys for those who own it that way.

Secondly, in the grand overall historical picture, BTC has only been here about 20 minutes.

Third, I think Bitcoin is more of a store of wealth than an everyday currency...but no doubt for daily use there will be alts/debit cards of some type that we simply load-use-and reload from BTC or other slow fat coins.  I truly believe Bitcoin will take the place of checking, money market and CD accounts.

My only real worry is the possibility of the quantum computers hacking in (although we've got time to build countermeasures) or something that kills the internet like a multiple EMT attacks.  Of course if that happens, we've got more problems than just currency!

We are witnessing and living a revolution!  We are making world history!