I only know the details of the WWE Network (followed it's progress, professional interest). It was initially launched in the US and took a while to roll out internationally, but in the first year it gained 1,123,000 subscribers domestically. Right now it's sitting at around 1.4 Million and internationally it's only around an extra 400k.
That's pretty good numbers considering their flagship show outwith the Network is drawing around 3 million viewers (sometimes less, dips to 2.5 million occasionally) per week.
WWE is a niche product and it's clearly making enough from subscribers, marketing and sales to grow multiple brands and specials to provide a good enough service to keep subscribers happy, and gain more.
CBS has a far more varied set of programming with drama's that have the potential to draw higher numbers (Star Trek, The good Wife, even with the Big Bang Theory or even Cheers library). If WWE can gain that much ground on a niche product in the domestic market, CBSAA are in with a good shot at gaining more subscribers - plus, even if they only get WWE numbers and under-perform for their content, the international right will keep them on balance while they work on their own subscriber growtth.