So there are two points here: different articles on one topic may contain different perspectives, so they all should be preserved when merging; on the other han

So there are two points here: different articles on one topic may contain different perspectives, so they all should be preserved when merging; on the other hand, it would be better if there was a single place where people would discuss a topic. Maybe a good solution would be to let people vote for merging several articles on the same topic, and once there's enough votes, merge them in one, say by concatenating both links and discussion trees? If that's too heavy, maybe just extend each article with links to other discussion pages (say, adding beneath the text "This topic is also discussed here (link)").