From my point of view, we need someone huge to announce Bitcoin acceptance, like some from top European countries. Or wealthiest company like Apple, Amazon, Microsoft or Alibaba Group would buy a large amount of Bitcoins. Or worlds wealthiest persons like Bezos, Brin, Gates or Buffett would announce they make large investment in Bitcoin. I think that might trigger price to go up. We need a strong price push to provoke huge growth. Without it, with natural price growth, it will take a lot of time or unknown amount of time to reach new ATH.
News like this will surely bring new ATH but just a temporary because big names like this will surely just enter if they will have something bigger to gain compared to there current investment right now. What we really need is a reall mass adoption on technology and not with the price alone. Most of the token holders nowadays is just looking at the price without even doing research on the main purpose of the coin. The result is pump and dump because all holders is just buying high and selling low.