Lets use my cleric for example. He has about 2800hp at level 36 with very nice gear for his level (few purples) and zero offensive abilities. (only silence and knock back is on the bar) A pure selfless healer.
Now, 2800hp seems like a decent amount to play casually with until something like this puts everything into perspective.
1500-2500 crits, from a DPS class who's designed to be a crit machine eclipses any sort of healing output players can produce. That puts everything into perspective about what the damage Twinking will do to the game because when the healers are gone, it's just a mindless spam fest.
So in conclusion, share how much HP your character has and your thoughts about if you could survive those kind of constant crits. I'm curious what solutions players can come up with. I seriously feel for the casuals now. It's going to be bananas, or a ghost town very soon.