plasma is cool but that would take some time to perfect.
Similar to that electronic solenoid driven intake/exhaust valvetrain configurations: technologically-advance (huge potential), but difficult to implement (cost, longevity and reliability shall always be a concern).
Maybe this may happen in my lifetime?
Sure, new spark plugs may cost $3 new, but what about the other stuff in a modern ignition? Having to replace some individual coils or coil packs can get costly.
The price of the plasma stuff might not be too bad.