Sure! But the only real changes to detection and handling of email spam at those two providers is that they have gotten worse at it.
If you want to have a discussion with DreamHost staff about this "off list" , you can do so by submitting a support request via the "Contact Support" section of your account control panel.
These decisions are the result of the behavior of AOL and Comcast, and that's where the subject needs to be re-visited. We are happy to send mail anywhere other than where it is not wanted.
Your users have other choices that do not involve terminating their AOL or Comcast email accounts (such as a free Gmail account, for one). Neither I, nor DreamHost, can force these providers to handle received email properly, and until they do we will either abide by their wishes regarding forwarding (as in the case of AOL), or take whatever posture we need to take to keep our mail servers from being placed on blacklists inappropriately (as in the case of Comcast).
I'm sorry that you see this as a potential "deal breaker" with regard to your DreamHost hosting, but this is not a problem that is unique to DreamHost, and you will see similar, if not identical, problems at most web hosting companies - or you will find their email servers routinely blocked all over the internet because of their mail sending practices.
--DreamHost Tech Support