What price Bitcoin will be be trending at when the bottom is in I couldn't possibly call at this point in time but mid $200 range seems like a likely bet to me and the likes of Risto will be forced to reassess their 'exponential mean growth line' speculating model. When this time will come I don't know, might not even know about it when it happens cos I most likely won't care.
So you're predicting a prolonged downtrend? I can see bitcoin going down in the short term, but I think we'll see more growth in BTC services this year, which will in turn, attract fresh blood into bitcoin.