I think we perhaps need to attack this from two angles.
Firstly, we need to ensure that DisplayLink understand that there is a large enough group of people who are seeking the 64bit version of the driver. So, as much as I am not a fan of "me too" posts in forums, given that this doesn't support voting - anybody with a need for working 64bit drivers should make themselves known.
Secondly, and I would suggest - more importantly, we need to make the manufacturers of the products that we are purchasing aware that simply "outsourcing" driver development to DisplayLink is unacceptable.
Log support tickets, call help lines, whatever needs to be done. But, contact your hardware supplier and ask them where a 64bit driver is?
(For that matter, ask where a non-beta 10.6 driver is 
)