Re: early kyu expectations
good ukemi = no matter what happens, you're going to not end up getting hurt because you can't take the fall.
Baring some sort of physical limitation, people should have good ukemi at or around 3rd kyu or after 1.5-2 years of consistent practice. There are obvious exceptions though.
People should feel obligated to have good ukemi and should be willing to invest personal time in getting it. Someone in average condition who takes the training seriously should have good ukemi after 6-9 months at most.