Years ago, nanobots were a large part of the supposed singularity (i.e. we would become effective gods over matter). However as nanobots seem to essentially be an impossibility they've been removed.
Recently I've seen questions over whether mind-machine uploading is actually possible. Quantum information cannot ever be copied (no cloning theorem) and there are some indications that parts of the brain may be encoded quantum mechanically. That's not to say the brain is a quantum computer, it just may require quantum information, like certain plants do in photosynthesis. Point is mind uploading is not definitely possible.
Similarly AI literature seems fairly inconclusive on how we can even measure our progress towards AI, let alone that we have little theoretical understanding of how a "mind" in general works.
Some of the discussion around the Singularity seems inspired more by assuming 1970s sci-fi can occur and is close, rather than a sober look at current technical knowledge.
Edited by Son Goku, : No reason given.