I voted for 5.000 to 25.000. The most likely price for me is around ~10.000-15.000 in 5 years.
That's how I estimate the price to evolve:
1) We will reach a new all time high after Segwit is activated - I estimate about $4000-5000.
2) Then things will cool down a bit. Until October I expect a drop back to the current levels ($2000-3000) because of uncertainty related with the November Segwit2x hard fork.
3) Another strong upward move if Segwit2x is approved in nearly unanimous way (or even better: if the hard fork is posponed to 2018 and has Core support). That one could cross $5000 and go as high as $7000 in 2018.
4) We will probably see a bear market for about 1-2 years after the Segwit fever is over. That will be the time when Lightning, Sidechains and other scaling solutions will be tested. I expect that then the old ATH will be tested again ($3000), but it will not be broken, or only for a short time.
5) In ~2020 we will cross the 2018 highs again and reach $10000. Note that the volatility decreases (also in the upward moves).
6) Another bear market drives us back to the 5000-7000 area.
7) In 2022 we'll cross definitively the $10K and head for $15K.
I think that is an optimistic, but not too utopic prediction. Let's see if it happens