Initially, it's clear some users have no interest engaging in a discussion, it's just a matter to post "Flash News: Russia did this and that, paragraph, read more here" but there are truly some who are. You can find whole topics of 'normal discussions' (crazy right?). Try to read the same in a Bitcoin discussion topic. I find it hard to force people to add their own thoughts and I doubt it will be better. They will add shitposts, I prefer to read "Flash News: Russia did this and that, paragraph, read more here".
How about making a discussion after the news article share in the OP mandatory then? I love it when the OP aside from sharing the news also discussed the article on hand, it acts a conversation starter on how the thread will go and it simply mitigates the chances of having a free-for-all/post-what-you-want kind of thread. Aside from that it also makes the news more interesting especially when the OP is also active in the discussion, because sometimes when members post news articles I don't find interesting at first but they do start a discussion it makes me (and maybe other members) want to join the discussion at hand.