Sure, if there's a market for it, viewers interested in watching and advertisers willing to support it financially. Problem is, which cartoons do you air? Though some fondly remember Looney Toons, Bugs Bunny and Tom and Jerry, that audience is 50 and over now. There were lots of cartoons in the 80s like Ducktales, Chip and Dale (sp?), Transformers, etc. but again, that audience is older. Adult Swim is still around, but it seems much of the programming on there had or has a niche viewership and sometimes a cult following - probably not enough interest for a 24 hour network. Even when series like "Squidbillies" was very popular on Adult Swim, one of my buddies dressed as a character from that show for Halloween, and few knew the series or who/what he was supposed to be.
Considering NBCSN, NBC's dedicated sports channel just folded and went away shortly after the last Olympics, you probably won't see an attempted revival of CNNSI anytime soon. As far as CNNMoney, there's already Fox Business and CNBC to provide financial and business news. CNNMoney may struggle for viewership and advertisers.