In the absence of anyone else to care whether we live or die, the suicide rate spikes for a spell. Some kill others as a favor, some find the means and the stones to off themselves. It'd be a messy affair.
Those who remained after that big ol' Purge would be the last humans for certain; I don't find myself attractive, and I don't think humanity is important enough to preserve just for the sake of it. Any additional conceptions would be the result of intoxication-fueled trysts, but it's unlikely those pregnancies would be carried to term.
That being the case, drug and alcohol use would also spike, as the assumed necessity of societal preservation would be lost, and with it, the impetus to fill the harsher roles that keep society alive.
But there would be no war, for though I do wage internal war near-constantly, I have never wished to do active harm to another. Also, the competition for resources would be eliminated due both to that initial mass die-off and the belief that there would be no future humans to need those resources. There'd be gaming and binge-watching for as long as the electricity lasted, writing, storytelling, and acting even after it was gone, and just kind of a chill vibe with intermittent bouts of existential dread.
This is my assessment knowing all that I can know, of course; growing up in a world of clones would probably affect the development of the younger set mentioned in the inaugural post, so their values would probably shift and bring about efforts to preserve this homogeneous humanity. I reckon they could do it if they really had to and really wanted to, but the aging Solomons would really prefer they didn't bother .