Guys, let me chime in with my perspective: first of all, I've been involved with the morphlines side of CDK (which is the lion share of functionality I'm interested in there to begin with) and worse comes to worse I'm pretty sure I can support it well enough. Essentially, because of my personal interest in technology I'd be willing to sign up not only for packaging support but also integration with the rest of Bigtop's components. I feel pretty pretty confident that I can get patches in.
On top of that, I believe we're already shipping the jars files of CDK in solr packages. This is definitely a bug from a packaging perspective (something I've been meaning to clean up for Bigtop 0.8.0). solr packages have no business re-shipping hadoop, CDK, etc. jars – they need to bind to them the same way we do it everywhere else. From that perspective I'd consider this very JIRA a bugfix, rather than adding new functionality (that ship has sailed when solr got included).
Finally, this is software right? Even if we include CDK today doesn't mean we can't revert the decision if and when we get burnt. For example, if I get strong, non-technical pushback on my fixes in the upstream CDK repo – I'd be the first one to start a discussion of either forking it or dropping alltogether