Those who didn't buy Bitcoin or etheruem now will surely regret not buying?
I think the problem is many people felt this at $20k, $10k, $6k, and now around $4k. While I think this is a fair price, I do think the opportunity will come around again as expecting rejection around $5-5.5k followed by a sharper drop to $3k. I don't trust the price stuck between the 100 & 200 Week MA. I'd feel a lot more comfortable with it coming down to the 200 Week MA / 50 Month MA, then this will be the trade of the decade I believe (or at least a four year period technically).
That said, the price is much better down (at 80% discount) than when it was at it's all time high of $20k, or a 50% and 70% discounts.
I realise other feel as the mining cost in 2015 was $200, the price of Bitcoin found support there, and in now it is around $3.5-$4.5k, so there is a theory that the price should find support here too, as it did in the previous bear market. But personally, I trust the charts over the mining cost due to it's fluctuations based on hashrate, as well as the cost being much much cheaper in the other countries (that can draw down the average mining cost).
I'd find it a lot more likely that miners mining at a loss will shut down, as they are doing and as the hashrate drops (as it is doing), then more will set up in cheap/subsidized electricity countries as a more sustainable and profitable solution. The mining cost last summer was rumoured to be around $6k in summer, and has clearly dropped (or been recalculated). I get the impression that in summer of 2014 the mining cost was probably around $300-$400, so it makes it completely subjective.
Sorry for the rant, but thought I'd share perspective...