Here we have the BTCUSD 1w MACD and 1w TSI.
Chart talks for itself, based on this, I think, the current correction/downtrend might take months/years.
I have no idea how long, but last time, it lasted from 27th of Jan, 2014 -> 12th of Oct, 2015.
This is neither a trading advise, nor a prediction, just a simple opinion from a non-pro.
Comments/criticism (preferably with indicators) are welcome!