Firstly what is Open Source? Surely OS just means free right?
Learning is Open Source. Modern learning theory will clearly identify that by far the largest amount of learning does not come from formal education but from copying others and experiencing doing things yourself. So if you think about it, this is very much the same approach used in OS software. When you learn you build upon what others have learned before you and their experiences, you then adapt it for your own circumstances to form your learning. If learning worked the same was a corporate LMS you would ask someone about something you didn't know and they would either tell you nothing at all or show you the answer without giving you the working out and knowledge would still be the gift of the entitled alone.
Training is Open Source too. If you take this model and try to teach out of original ideas only where would you be? Each great person only saw further by standing on the shoulders of those that went before them and building on that, not returning to square one each time. When I used to teach I would take the things I saw in other teachers, in other classes, in books I'd read and films I'd watched and make it my own. I then shared that freely with others, students and teachers alike. Not for my only financial gains or intellectual rewards, but because it is the very nature of learning.. it is Open Source.
And here comes the point. If learning is Open Source, if teaching and training are Open Source, if the very nature of understanding is Open Source.. Shouldn't the systems you use to teach, train and learn on be Open Source? I mean, who wants a system built into a corporate model that isn't remotely connected to the model of function it supports? So for learning technologies if you're not in Open Source are you out of touch as well?
Long live Moodle, Totara, Mahara and actually the different things that they will become that are far and away better than the original products because (again) that's the nature of Open Source.