I would hope Dtube fix the video availability and not take them down. Keep in mind that hosting all that video data requires a massive storage system.
The videos cannot possibly go on the blockchain. The blockchain is meant for small transactions such as money, votes, and text. I believe pictures are not even on the blockchain. The blockchain actually has links to the database that stores them.
If a blockchain had the ability to add pictures and videos to the blockchain, it would quickly overwhelm the nodes.
While your text and money is decentralized and protected by the blockchain, the pictures and videos are not. Sorry.
If you are truly in need of protecting your video work forever, here is how to do it. You secure a domain name and host the video streaming from a server that you own or from server space that you rent. Then create STEEM blog and link your video feed within the blog. The link is text in the blog, so it is forever stored in the blockchain. You then have the control of keeping the video available or taking it down.
I know that it is a lot of work and not really practical. But here is the catch, If you learn how to do this, you could generate your own Dapp video channel to compete with Dtube. You know Dtube takes a healthy cut of your creation rewards.....
No. They took down Gab.com. They attacked Infowars.com. They have their domains but they were taken down. Websites are being attacked. Did you not see that? Everybody's talking about it all around the world. It happened many times already. Videos should be on the blockchain. It needs to be done. Don't say it's too big, too hard. I am shooting for the moon. I was told that pictures are stored on the blockchain via a BitTorrent technique. And a video is a bunch of pictures. Blockchain can do it. We are working on it. And it's only a matter of when. It will happen if it hasn't already happened. It's coming. Mark my words. Eat Oatmeal.
I don't think there are computers powerful enough on this planet to operate as nodes that run a blockchain that stores videos. I am with you though. I wish there was a way to make it happen.
It will happen if it is not already happening. It may not be as hard as some people might say it might be.