On 2e: my naive intuition is that for it to count as a "true" IA singularity and not just one of the other kinds of singularity helped along by IA, it'd have to be of the form "Brain-computer interfaces means the minds have both a wetware and a software part, the software part grows much more quickly, and after a while you can just remove the wetware without much of value being lost." or something like that.
Suppose we could look into the future of our Everett branch and pick out those sub-branches in which humanity and/or human/moral values have survived past the Singularity in some form. What would we see if we then went backwards in time and look at how that happened? Here's an attempt to answer that question, or in other words to enumerate the not completely disastrous Singularity scenarios that seem to have non-negligible probability. Note that the question I'm asking here is distinct from "In what direction should we try to nudge the future?" (which I think logically ought to come second).
Sorry if this is too cryptic or compressed. I'm writing this mostly for my own future reference, but perhaps it could be expanded more if there is interest. And of course I'd welcome any scenarios that may be missing from this list.