It seems that ORDB is going away, so if you use it in your RBLs then you should remove it.

Looking at my stats it seems that ORDB hasn’t done very much so it’s not a great loss:

xbl.spamhaus.org 78.89%
list.dsbl.org 19.31%
sbl.spamhaus.org 1.21%
dnsbl.sorbs.net 0.57%
relays.ordb.org 0.03%