If you get it in January of 2018, would in count as carryover for 2019, since there is no more carryover after 2018?. I am sure going to miss carryover, I don't need it , but for my daughter.
2 totally different topics.
Rollover (carrying forward extra night credits) is ending.
That has nothing to do with status, which it appears you are asking about. Status earned in 2018 is valid for the rest of 2018 + all of 2019