This was my first reaction. This seems like a weird marriage. Virgin America is one of the western world's most innovative regional carriers (along with Norwegian, IMHO), and Alaska Air, from my experience, is kind of the opposite.
Paperless tickets.. really? That's so 10 (20?) years ago.
http://www.businesstravelnews.com/Business-Globalization/SAS...
Since VX has had those exact same amenities plus additional others for longer, and AS is not going to keep the Airbuses around...from the perspective of a Virgin flyer, Alaskan wouldn't seem that innovative.