If this year will be bullrun it will definatly go over 30k, even 50k is possible.
If ETF is approved there will be many newcomers as well as many institutional investors, whales, media hype, FOMO, global goverment regulation approval ...if we cross 50k,BTC will enter 2nd generation and 100k or even more is not a dream.
If not this year then 2019 2020....it will happen eventualy...there could be a chance we shall never see BTC at 6k again! Buy if you can