Before the chart is completed I think we need a definition of what a "Success Scenario" is.
And also a definition of "ideal for bitcoin."
That is for each person to define.
Actually, the Widespread Use is variable as your looking it from an Optimistic point of view. What if Widepread ends as the Genesis?
You are saying the "value" during widespread use would be 0? This doesn't make sense to me. If you think even during widespread use the value (in whatever units you want) should be low, then just put 0.01 in that box. Perhaps I should add some more boxes for units.
Maybe I misunderstood your chart. What if bitcoin eventually dies. Not that I want that, Im buying Bitcoins daily but the US Government didnt start the war yet.
With your chart you are saying the Widespread Use will end Up.
THIS IS JUST AN EXAMPLE.

What I mean with this is. You say thats wrong complaining ofthe volatility because you are saying that Bitcoin will ALWAYS FINISH with increasing Widespread Use.
But the problem with volatility is that you don't know when you are in the top until the time passed.
What if I have a store and Im selling thing with Bitcoin, just the moment when its at its best usd 160 example. And then starts to go down for weeks. I have to pay my suppliers that dont accept Bitcoin, sell my Bitcoins at low price. But then suddenly starts to grow up again, and I'm buying Bitcoins at the expensive price.
You are gambling when you sell with Bitcoins. Personally I think It going to go up and never stop, but I can be wrong. But I am aware that its risk accepting bitcoins and thats why people complain about volatility.