I honestly think it was the layers of Hasbro/WotC that had the final say in pulling the tools, more than the design team. They probably could not wrap their heads around giving out the information in the books without making the people pay for it twice. As Trapdoor mentioned in their video interview, at the time they were waiting on approval and pricing from Wizards to submit it to Apple. They also said this was the first of its kind e-reader/tool.
I'm personally excited about the prospect of the software continuing on. What they were talking about for features beyond the character builder (which is the bare minimum) is what really excited me. To be able to purchase a published adventure and have all the goodies available to easily share with my players would make my life as a DM infinitely easier. Hell, if it turns out they struck a deal with Pathfinder, I'd honestly jump to that system.