I think people are not ready to accept tiles as their home screens yet. Just like how they reject Windows 8 with the new start screen. They do not find themed colors squares and rectangles attractive at all. Some of my friends even asked me why WP has such big useless banner on the top in the hubs.
I tried to intro Lumia to a friend who was looking for a new hand set. But can't convince him at all after he did some researches. Things like missing Candy crush, inflexibility to share any files, missing file manager, lousy music playlist creator, limited video codecs, etc actually turned him off. Now without great app support, how do MS expect people to jump onto the bandwagon? Without user base, developers will not be interested to make for Windows Phone. So this is a vicious cycle between Windows Phone and apps availability.
I think it will not be an easy path for WP to grow. Even adverts from Nokia is all nothing but funny ads about cameras. Take a look at Samsung Note 3 advert and it actually promote how one can make use of the stylus for their life styles. See how HTC talks about Zoe and boom sounds and ultra pixel. I hope MS will do better adverts now since Lumia is in their hands.