Dear Kyle, Thank you very much for this forward information. I think it makes a lot of sense to drop the profile blogs and guestbook. These would most certainly be better served by the existing Blogs feature and CB activity plugin. The future reviews plugin would be a good addition that I would certainly use.
I only hope that continued support for K2 integration for articles and blogs will continue as this is critical for my site. All our member articles are in K2 and this is essential for our site. If there is any future plan to drop K2 in the future I would certainly like to know as soon as possible.