I agree that I don't think YouTube will ever go away completely just because of its hulking size in comparison to anything similar to it right now. I do think it's possible that it could lose its spot as the largest as long as it keeps making the mistakes it's currently making and someone else takes advantage of those mistakes and doesn't miss their window. I'm not able to state in absolute confidence that YouTube will become irreverent (I don't think it ever will) or even drop from being #1 on what it does to be honest. I'm trying to make the assumption that if they continue to neglect aspects of their site they leave that door open for competition to close the gap between say YouTube & Steemit. I think you're right in saying YouTube won't go under completely due to its size and it always has Google above it.
I agree that you shouldn't put all your eggs in one basket but what other platform is comparable to YouTube in service and viewership? I can't think of anything as large as YouTube or as unique as YouTube (something fitting both those criteria is what I'm getting at.)
I also agree with your last paragraph being that Steemit is very different than YouTube and it's kind of its own thing all together not really comparable to many other social media sites. Steemit seems like Reddit almost in terms of how you share your content you've posted on YouTube. Especially since Steemit doesn't have any form of repository for videos in the first place. I just found it an interesting topic being someone whose only been on Steemit a week and I've already made double what I've made on YouTube. It got me thinking what if Steemit decided to compete to some extent with YouTube in the future. Could they compete? I believed yes because of the monetary gain people have the potential to achieve & the fact that the community is so warm to most people new & veteran!
Thank you for your comment, mate. It really let me think about my article from another view point and kind of see it in a new light! I hope my response allowed you to understand what my intentions were with the article as well as reply to your thoughs! :)