To be honest, I'm annoyed by this prolonged bear market and I would like it to stop right now. I drew some lines here, however, which would indicate the bottom around 200$, maybe even a bit lower in summer/autumn 2015 (and after that hopefully breaking upwards to da moon)
Pretty similiar to what i was thinking. However i also expected it to hang around $500 by end of the year, so the bottom might actually be lower. And there are still a lot of requirements missing (ease of use, low fee accessability, incentives from merchants), but mid year next year seems possible. From there on an exponential growth seems reasonable. Might well be like 30%/year. So the ATH could easily be broken in less than a decade.