the long term charts are highly correlated, but the stock market falling shouldn't directly affect crypto. the question is whether a larger financial crisis or depression is on the horizon. that would affect all markets, including stocks and crypto.
it's mainly equities and crude oil that have been hit hardest and both have staged solid recoveries (or at least the beginnings on one). the current dip in stocks hasn't exactly spread to other markets so i'm inclined to reject the idea that a major financial crisis is about to hit. the economic numbers don't support the idea of a crash either (yet anyway).
so i'm thinking 2019 will probably be a pretty sideways (but volatile) year for both stocks and bitcoin.
I certainly wouldn't say the long term charts say they are highly correlated. I think if anything they show there is no correlation, and that bitcoin's market cycle has had nothing at all to do with the stock market cycle, though that could change as bitcoin becomes larger and larger and therefore is affecting by the movings of larger and larger entities in the global financial system. Unless you are just saying they've both been in decade long bull runs which isn't really fair to make any assessment of the correlation then.
While the US economy hasn't turned yet the stock market has and bond yields are turning and several other things. Not to mention that US stocks and economy are massively propped up respectively due to the giant tax giveaway to corporations that got investors all excited leading up to it in 2017 (which immediately after it passed the markets had zero reason to go up anymore) and the hundreds of billions of dollars annually of extra deficit spending the US has done over the past two years. At some point that house of cards is gonna fall back to reality and thats when we get real negative movement, not just the 20% fall the markets have seen recently, which is only the beginning or the turnaround.
Anyway, I think Bitcoin will be sideways and then upwards later in the year, while stocks will probably continue to be very volatile and slightly somewhat downward as I don't think the economy will start going down until 2020 probably, which is when we'll really start to see some falling stock markets. Basically, I wouldn't touch stocks for a couple years, and would be (and am!) accumulating as much bitcoin as possible right now to sell on the next boom which hopefully occurs while stocks are still recovering to hit both upswings in a row!