Yeah I wait it too.
But I think if 100$/BTC the price is only getting down, not getting higher

yes, very few people will have interest to invest in bitcoin anymore, I don't think the bitcoin users can handle another crash. So many people who bought at 1000$ will be heartbroken to see their investment value at 10 percent now. I think if hits so low, there will be no point investing in it, I would definitely get out of the bitcoin world if such a situation takes place.
I would do the same, no point in staying and investing in bitcoins and need to face the reality, that if bitcoin gets $100 or less, then I think it would be the end of bitcoins, and then we can't expect that it would reach $500 mark in the future, and if it does it would surely take a long time to reach that level. And it would be just a waste of time.
According to my speculations, I don't really think that bitcoin will fall under 200$, because there has certainly been a definitive increase in the supply and demand of bitcoin which won't possibly take it anywhere below 200$ (minimum). If situations arise which make bitcoin go under 150$, I don't think so I will genuinely be involved with btc. I might do short term profits with it but holding won't be fun anymore.