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But can you actually vote on Viewly like in DTube?

Not sure, I think their platform is still in the making.

Diversification doesn't seem to be a bad idea in general. It may be a good idea to simply post to both... or would that simply just spam your vid posts?

hmmmmm...
just use what seems to be the better product at hand -- let the free market decide!!!

I think it is a valid idea to post to both platforms. I think DTube offers a way to not show the video on your profile but I am not sure how.

Interesting and a good thing to have. I can see someone already hosting newest GoT episode there and getting 120$ for it.

Possible but I don't think it would be good for either Dtube nor Steemit.

You're probably right. It could be built as a whole different project if good purpose is found.