So what if there was no huge point to the last incarnation of the Brotherhood? The name's a joke now anyway, so why not make a joke out of forming them?
It was an arc where the entire point was a fight. And even if there was no point to the arc at all, it was still cooler and more entertaining than Date Night, and with better art, so it beats Kirkman out there.
Always choose the lesser of two evils.
The creation of a second Xorn, not to mention the invisible "friend" in the back of that nurse's car, and whatever else... had Austen stayed on, it might have been better. Had a writer better than Milligan come on after, it might have been better.
As we have established, this is not quite the case with what Kirkman is doing with Ultimate. Again, lesser of two evils.