Yeah, I mean, even with things the way they are now, Eldar, Tau, Dark Eldar and Necrons all have vehicles that are irritatingly resilient in some way or another.
Eldar have Holo/Energy Fields
Tau have Disruption Pods and good AV
Dark Eldar Have Flickerfields and Night Shields (these are the least resilient, but man are they -fast-)
Necrons have Quantum Shielding and Living Metal
It's not like the vehicles any of these races possess are helpless by comparison to the Imperium...and Eldar/Tau are the only ones really in need of updates right now. I think DE/Necrons will survive the transition to 6th just fine more likely than not.