My idea is simple:
If XEM devs cannot stop stolen token sale it has a big trust problem.
When ETH were stolen there were roll back and coins were defended. ETC stayed in old road with stolen coins and it took 2 ears to recover from it.
I do hope that xem will recover but even I feel that trust were lost and moment till now I do not see any strong XEM dev confirmation that problem will be solve.

From what I understood, coincheck itself was the biggest loser of the hack as the biggest part of the stolen XEM belonged to them. The customers that lost XEM get their coins back. Is it really necessary to do a hard fork for a company that created the conditions for the hack itself (by keeping all the coins in a hot wallet).
What is annoying is that, if it is true that already 84 million dollars worth of XEM are laundered, there is still more that 400 million dollars worth of XEM waiting to be laundered.
Let's see what happens in the coming weeks/months. Hopefully the news of catapult being introduced to the world may affect the rate of XEM.
At current prices if he has sold $84 million worth. That's 168 million NEM which leaves 322 Million Nem which is $172 million. Still a tidy sum but my guess is this will be a drip feed into the overall market and should take some time.