Unfortunately it's probably the most important python package that doesn't support Python 3, it would be cool to see it upgraded. Apparently the hold-up is supporting very old 2.x python versions because of RHEL.
On the other hand, Ansible itself could have a tiny bootstrap step which installs Python 3 on all the remote machines before it does any work.
In our case, we use Ansible daily for deployments, but haven't actually written any custom Python modules -- it's all just straight Ansible YAML. So I'm guessing for a lot of use cases it doesn't really matter what language Ansible is written in.
Tried it a while ago, interested in developing tower-like management software(light-weight) using javascript as Tower is a bit too pricey for small/mid-sized customers.
"Agentless" means that it works by pushing to the machine and that there isn't an agent process already running on the target. It doesn't mean that there aren't any requirements on what needs to be installed on the target already.
This is NOT a switch from py2 to py3 we are aiming to support BOTH at the same time, this is not a trivial task (specially with 2.4) and will probably take us several versions to implement.