Futures has the first capacity to exert a downward pressure on the cost, as up til now it's been impossible to short. However, I'm still just gonna keep buying in with whatever cash I have on hand, as nothing futures can do will change the fact that:
1) There is a finite supply of BTC
2) There is growing interest in BTC based on media (when my sister wants some you know it's going wide - she's a 7/10 normal girl)
3) BTC are entering the real world marketplace.
Just keep putting money in them and wait it all out. Futures will have a generally downward and stabilizing pressure, but overall the more news articles that come out, the more #2 comes into play and given #1, the price will just keep going up.
After casually watching BTC for years and thinking every dip/bump was critical, what you realize is none of it matters. This sh*t will just keep going up over time. Depressingly so. You can't fixate on even 30% or 50% price swings when you're looking at something that you are hoping to make 1000%+ gains over time.
The most practical approach is just to keep buying with whatever cash you have on hand, take some other coins to diversify, and bet that the cryptoeconomy will become real and you will ride into it.
There's pretty much no point in even selling any crypto at any time in my opinion. Just buy a bunch, and try to ride them long term based on which you think have the longest expected lifespan (IMO based on still limited research BTC, XMR, LTC, ETH). If the cheap ones fizzle out and go bust, who even cares? They barely cost you anything if they're cheap. And you only need a good investment in one coin to go massive to cover your potential losses from other coins that go bust. As long as you're putting it in the top most likely to succeed coins, who even gives a sh*t about up/down swings?
Just ride it all out to Valhalla or oblivion. My opinion anyway. I'm putting another 7K in through my shady broker on Monday. These swings are in my opinion all meaningless and impossible to adequately predict or ride without a lot of time to obsess and luck. If you play the long game even 200% swings mean nothing. This coin went from $100 to $19000 in the span of just a few years, and it's nowhere near a stabilization level yet in the shape of its price-time curve. Interest in it is continuing to rise.
I have to submit my verification info to the legit exchanges tomorrow so I can cut out the shady local dealer I'm using now.