Bitcoin below $3,000 is very hard to achieve, even after the recent buzz created by Bitcoin Cash; Bitcoin still stands strong in the market it was expected that it may crash to $5,700 which eventually happened but Bitcoin value is again $6,000+. Bitcoin crashing below $3,000 is only possible under harsh conditions when everything goes against Bitcoin like ban on Bitcoin in countries, user base declining due to rumors, ICO ban and so on but over all reaching such a dip can be very harmful for the market.
but nevertheless we are witnessing a completely different trend in the world of crypto currency. popularity is growing and with it many countries are starting to work with bitcoin and with its technology. let it not mean real legalization, but it already says a lot.
This increase in popularity and so many huge investors wanting to come in is what is making the bitcoin community to keep getting strengthened and for values like what is stated by the OP impossible.
So far so good, as we have broken the resistance blocking us from moving forward, I am envisaging a bull run right now. Legalization to me is not a threat but a welcome development as it would create awareness, but that does not give government control over the currency itself.