Maybe it's just late and I feel like typing this thought out, but I think the synergy needs to be more complex and yet natural.
Take Madden for example.
The strategy I would want to see for it would be 'Connected Everywhere'
On tablets and smartphones: A free or low cost app to manage rosters, league settings, XP points, social elements. Some mechanical things like free agency and the draft too. Create teams, maybe take photos with your camera to create stadium posters, whatever.
On Vita: Most of the capabilities of the tablet apps, but also be able to do some training and other drills with squads of your players for some benefit. Offense, defense, 7-on-7, 1-on-1, etc. If possible, games should also be playable, but that necessitates a full price title then, which is OK too where it makes sense. So on the go let me maintain my team and activity in my CCM with mini games and whatnot, at a reduced price like $10. Or this comes with the Vita version of the full game if it can run and work well with the console version.
On the Consoles: Most of the above, in addition to the expected.
Now take that approach and apply it to other games. Social and mini games on the portables and handhelds... full games where it makes sense on the handheld, and the full console experience on the core hardware.
This then translates naturally to the next generation of consoles which will further outclass the Vita hardware by comparison.
Blur the line between 'app' and 'i want to be a console game' with a dozen shades of gray. Let reviewers distinguish between diamonds in the rough and 'horse armor'.
I am sure there are a lot of problems with this approach, but it feels like more than what they're doing now... and something like this that is flexible and worthwhile will increase consumer spend on both hardware and software across multiple platforms, as well as provide additional marketing opportunities to spur that growth/adoption with cross-promotional discounts/vouchers for pre-orders, ordering one or more from the platforms, etc.
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