I find it odd how Discovery Kids didn't change to The Hub in Latin America. Even more odd is how Discovery Kids (not The Hub) launched in India and Southeast Asia in 2012. These channels even aired Hasbro cartoons...Out of the ones listed in the OP, only Fox Family realistically had a shot. Everything else was in another tier of cable. They were never going to close that distribution gap. Disney XD couldn't and that's despite the weight of (then exclusive) Marvel and Star Wars programming.
There are a lot of reasons The Hub failed. It replaced a dying channel and inherited its distribution woes. It launched while the U.S. economy was still struggling. There were no international affiliates to help spread production costs around.* Ultimately, I view its failure as being on the hands of Discovery. Hasbro tried, but as mentioned, giving them operational control negatively impacted ad sales due to fears of funding the competition. They weren't the company with decades of history running TV channels either. On the flip side, the zombified state that Discovery Family is in suggests they just aren't cut out for this segment.
*Mind you, this was probably a positive for Hasbro Studios as it meant they were free to sell these shows to anyone internationally. Mainly channels that were far more established in their markets than a newly launched Hub affiliate would be.
Discovery Kids now also exists in Australia, and Discovery Family in the Middle East and France. (but the French version doesn't have any children shows)