Notes about fundamentals
Bitcoin is not dead. It's simply fell out of fashion. People stopped talking about it. It's also not so easy to buy with credit anymore. World outlook is improving with the NK news and such, so people are feeling safe to hold fiat currency again. The credit cycle is also ending (interest rates going up,) meaning cash will be king for a few years.
Notes about regulation
Regulation is getting stronger, yes, but in the most positive way. Recently, Japan punished a bunch of exchanges, which is possibly one reason prices started to plummet. But we need these kind of actions to stop really bad things from happening. If exchanges are allowed to operate completely unregulated, then we will have more hackings, more Mt Gox events, more employees running off with the money. Of course, decentralised exchanges should fix these issues, but until they become good enough to compete with centralised ones - we have to rely on regulation. Note that also exchanges buy and sell into fiat currency. Whether you like it or not, fiat is regulated, and thus in order to trade for fiat you need to understand regulation is required. If you want to go completely off the grid, don't sell your bitcoin into fiat and consider trying to use it to pay for everything without converting it to fiat first.
Not only that, but decent regulation means that profiting from bitcoin trading is legitimised. People who managed to make stupid amounts of money last year were probably a little worried about (a) if the money they had was actually real, what if it got hacked, an exchange didn't send their money to the account, they failed KYC tests, etc. and (b) what would the government have to say about it?
The kind of regulation and government scrutiny Bitcoin is getting right now is THE BEST KIND. It's long term . It legitimises bitcoin , keeps investors safe, and allows Bitcoin itself to keep running as it is - a completely decentralised store of value (besides the buying and selling into fiat part.)
I am super on Bitcoin long term, and wish it the best
Bitcoin is one of the greatest stores of values known to mankind, and a genius invention that should stand the test of time. Although a competitor may come along one day, until then, I remain on Bitcoin , and will do whatever it takes to increase my stack. Remember what happens after bubbles pop - accumulation, and eventually long term appreciation.
I suspect we are currently on our last leg down, and the "capitulation candle" is coming. This is the selling climax, and will become an excellent buying opportunity.
Eyes on the game! and don't buy on margin.