I think next year will be even better sales. For example I think the combination of having Total War and Warhammer together will boost the sales of the next entry. I think right now the highest selling one (under SEGA) is Empire with over 3 million units. I would beat that Total Warhammer will do over 4 million when its all said and done.
I also think the next Sonic the Hedgehog title by Sonic Team, which I assume will be on multiplatform titles, will do a lot better than Sonic Boom, which isn't a hard thing to beat. I will say 2 million is a easy to reach for number.
Then we also have the next Creative Assembly blockbuster title that SEGA has been teasing. Now that Creative Assembly has that in-house engine that ran Isolation, I assume cost/profit margin will be larger for the next title.
The only thing I'm scared of is what the Yakuza team will be working on. That is a series that has been constantly down (slowly). I think the team really needs to give the franchise a break and try to get a new passion project up and running (not a game like Binary Domain that has a agenda, like being 'world wide hit', just a game they want to do).
I also think mobile titles will be more focused, less titles that will more likely bring in more money. SEGA is really understanding the trends of mobile better than most Japanese publishers. I assume Sonic Runners will be huge, especially if they tie-in items and unlockables with the console game like most new triple A games are doing.