If your sure you won't vacation this year I say bank those points. The only reason not to bank now is if your not sure, you can only use 50% of next years points but again if you know you won't go this year banks away! I have already banked my points from 2019 into 2020 because I know I won't be there before Jan 2021.
I banked my 2019 (December) points early - I could have waited until July. I was concerned that Disney might restrict banking at some point. As it turned out, they did restrict borrowing, but not banking.