It's been shown that people do learn a little bit faster than they would have with a book. But it's not clear that the benefit isn't from just having reorganized the material better. It's more expensive to do this than to create a book. It's not cost effective. Computers change and programs change and therefore the original program is not useful anymore.
Text lasts for ever.
In the '80s, computer-based graphics machines came along that could do graphics and video and sound. People began doing multimedia programs, like CD-ROM encyclopedias. There's no data to show people learn any better, and the production costs are very high. The facts show this stuff doesn't work. We already know about multimedia and it's called television.