can sales tank any harder than they already have? lol..
kidding aside.. i do think the lumia will continue to sell well. the only unfortunate part of the upgrade is that wp8 apps won't work on wp7.
wp7 marketshare is at what.. 1% in the US? like it or not, MS was forced to do what they did with WP8.. WP8 will finally be a viable platform/alternative to ios and droid and offer things that both can't.. the stability of iOS and (some of the) flexibility of droid. the gaming aspects as well as the integration with windows 8 is another really unique thing.
those of us who are using wp7 now should really have seen this coming. i sure did. and seems like most wp7 users commenting aren't really that upset about it, so idk.
i do think the lumia will continue to sell decently well until the launch of wp8/windows 8 at which point things should take off in a more meaningful way than they have..