For a start, I think Sony needs to market the Vita as the "must have" accessory for PS3 owners. All top selling PS3 franchises should have a Vita companion app similar to DUST514. I can see a companion app for Starkhawk that allows players to use the Vita to control the building of battlements etc. to complete the whole build and battle gameplay.
They are doing that in a haphazard way. At the same time they have to balance exclusive Vita games vs ported PS3 titles. A lot of people prefer to buy the technically superior PS3 version instead of the more comfortable Vita version. In addition, they also don't want to pay twice for the same game.
For now, the Vita sales pitch looks like a work-in-progress. We have sporadic Cross-Play Vita and PS3 games similar to your suggestions, we also have a handful of exclusive Vita games. They just sent out a survey asking people if they like the idea of "pay-once-play-on-Vita-and-PS3" titles. As usual they are very shy to talk about Vita, to the point of messing up all Vita presentations to-date. ^_^
I happen to think that they should not position Vita as a WiiU competitor or a remote control pad. For one, Vita is much more expensive than a WiiU pad. It also can't compete with an iPad in terms of general functionality.
It can do more in the event of bad connection. It is not uncommon for WiFi to drop in my second bedroom. For Vita Cross-Play titles, they work even without a connection since they are also standalone games in their own right. For other Vita mobile titles, they only rely on a connection for posting scores and stats.
Vita is also more personal than a WiiU pad. I keep stuff I don't want my kid to touch on my Vita, so the PS3 stays clean. This can be addressed by using a multi-user OS for the game console next gen, but for now I think Vita is a much more personal experience than a pad.
Also, what about a PS Home client for Vita?
They should revamp Home first. Was going to post about Miiverse.
Vita has integrated a 2D Home-like experience into the OS itself. It's called LiveArea. Before you launch an app, you always enter the LiveArea of that app first. The LiveArea keeps notifications, updates, help, shortcuts, friends info specific to each game. Developers can customize their own LiveArea fully, like deploying a custom Home space.
It also does more than PS3. You can create a party and jump from game to game. It is currently optimized for a power-saving mode. So all network traffic are connectionless. You have to wait for it to reconnect after the session times out quickly.
You can also play music while you game or surf, if you like that sort of things.