I am surprised they didn't do so sooner. I would've sold everything I could right away after they're confirmed dead. There's no coming back from this, even if they had another sub.
Yeah I can’t even imagine trying to market another trip. You could never escape the negative reputation of this, why wait so long to announce that it’s over?
It might feel like forever in internet time, but it's only been two and a half weeks since the thing imploded and two weeks since the rescue operation was called off after finding debris from the Titan. Two weeks is lightning fast for a company to formally shut down in response to something like this, especially when you consider that the company's employees have been grieving the death of their CEO/friend during all of this.