There is literally no evidence to suggest the price could drop drastically. Bitcoin has shown to be way more stable than that, a single ruling isnt going to change the fact that tons of people and legit businesses are switching over to bitcoins.
Yeah the price may drop a few quid, but some of these posts say markets will scam and shiiiiiit? Markets have better things to do than be dependent upon a SEC ruling over a bunch of brother's aim to sell out bitcoin and list it on a stock exchange.
Even if it goes down, its coming right back up as we have seen a million times over the last few years. China exchanges are just getting approvals for KYC regulations and once thats in place any time now, the price will go up even more.
So keep the fud to yourself, yeah if you have btc either sell or buy more but thats your decision and this is some weakass form of manipulating the price before the ETF decision.