A great example is Japan's Nikkei. It still is unable to break its ath made on 1990. That's like almost 30 years ago and backed by one of the best economies in the world. It could happen to BTC too. IMHO. Maybe not that long... But long.
It could. It could not. This market is just one spark away from bubbling up again. The sentiment is what people pay attention to. Last year people were convinced of $50,000-$100,000 and now we're going down people expect $1500 to be the next bottom, and have the bear market last years and years. Everything should be taken with a truckload of salt.
In the end, we don't need the price to keep breaking one insane level after the other. The hypes we're going through never last long and the correction that follows makes people's stomach turn badly.
The best thing is that markets don't do what we think they will do, and if enough people are convinced that we'll keep falling, we might be up for what people refer to as a recovery. People were overly bullish above $6000 and seem to be overly bearish right now. It's going to be interesting to see what happens from here.