To me, it’s obvious that the Bitcoin Cash “hash war” has been what’s triggered the fall of the 5K support level (and to me, it’s telling that 200 messages in, no one has really even mentioned it).
The contentious fork has been very disruptive, causing BCH trading to be halted and lowering trading volume across the board. At the same time you have a huge redeployment in mining resources, up to 4exa on the Bitcoin.com pool alone pointed to BCH to defend vs a BSV takeover attempt (along with threats of 51% attacks and long range re-.org attacks) - up to 30% of SHA-256 mining power was pulled, mining at 100-200% less profitability of BTC, which also would have had some pretty big effects on the market (potentially parties dumping BTC to fund hashrate, potentially other miner related effects).
This sort of shakiness/distraction/fud drives the whole market down, which drives more selloffs, which drives articles and discussion like this, repeat.
Now that this seems to be largely over (and exchanges are opening BCH/BSV back up) you’re actually seeing a bit of a price/volume bump after this cratering, although I think people will be skittish for a while. I think it’s right to be skeptical - the people that are building real things will keep doing so, largely under the radar, and the markets will do as the markets will.