I may sound like a broken record, but I find Raonic a bit overrated. Yes he has a tremendous serve, that is a fact, and yes he can put anything away with his forehand but he also misfires a lot.. People talk about his great mental strength, but they do so hypocritically.. I mean many of these same people poke fun at players who struggle mentally at the slams but for some reason praise Raonic's mental strength? I thought slams were what mattered? He had a nice run in Australia last year, but I thought he was fortunate with the draw and certainly with someone as good a serve as him, it is always likely that they can get a couple big wins under their belt. However, look, virtually all the top players know how to exploit his weakenesses and over best of 5 sets, Raonic is just waiting to be dismantled. Compare him to other great servers especially at the slams, and you realize how poor Milos is. It isn't a knock against Milos because again, he is a fantastic player, but I don't see him getting to the top of the men's game for a long time. He has a lot to improve. Karlovic had a bigger serve, was more difficult to break (his break points saved during his best years were fantastic) and he peaked at 11 in the world if I remember correctly, and only had 1 GS QF where he still got outplayed rather easily by Federer.
Yes, he did have "close" matches all year, namely against Federer 3 times, but again, none of these matches were at the slams, and not to mention, it is only natural that these matches become "close" considering his serve, so I think the thought that he "should have won" is a bit misguided. Where were these same people calling Raonic's matches close when Ivo would lose 6/7, 6/7? It is the same thing. Big servers make the scoreline close and put mental pressure on the other player to make sure they don't give up their serve for free, they aren't necessarily forcing the issue.
Might be a bit off-topic to bring someone like Tomic into this, but Bernard is a much better pick IMO to watch for. Yes, Tomic has struggled as of late, but unlike Raonic, Tomic has shown he can really hang with the big boys in best of 5 set matches. He showed his potential against Nadal in Australia, had a good match beating Soderling at Wimbledon, should have pushed Djokovic into a 5th set at Wimbledon and gave Federer some trouble at Davis Cup. Of course Tomic still has loads to work on himself, and of course he does have to take things one at a time, as in win smaller events first, but he has shown his potential, because winning at the slams is a completely different beast than winning 1000s/500s/250s..just ask anyone on the tour
So in short, I don't see much potential with Raonic at the slams, but his ranking will most likely go up as he is bound to have good draws for him at smaller events and upset a few top players here and there.
As with Pospisil, I find nothing special about him. Just another younger player with talent but not really have anything more than that. There are plenty of Pospisils on the ATP that can never breakthrough and end up becoming journeymen.