1) Markets live in cycles and any bull market has to be followed by a bear market
2) (which is my favorite indicator) shows us that bears were especially strong following the DAO hack event, but bulls were not able to gain such strength afterwards
3) After the all-time high, we've spent as much time being down as we've spent being up (demonstrated by MTPC indicator), which I think means no good for bulls
In the chart, I've demonstrated possible support levels to be broken in case if bears make a move. Of course, it might go up as well, but even if it happens (for which I do not see any technical reason), it is not going to be for a long time.