Personally, I lost faith in the Python core team because of the Py3 migration. Yes, 3.x now has a bunch of nice features that 2.x did, but almost none of them actually depend on the 3.0's breakage (as proven by Tauthon).
If you want people to follow you through a break-the-world migration then you need to motivate why it is needed and why it couldn't be done incrementally, not try tempt them with a bunch of unrelated carrots that are bundled together with the breaking change.