Lasers are relatively cheap at this point.
I'm guessing they could pinpoint an ignition spot using multiple lasers. Would be pretty cool. I mean, yeah, it would, initially, be more expensive than a plug setup, but all this crap gets cheap after 3 or 4 years of production. Initial return would undoubtedly be low, if not a loss, but after 7 or 8 years of production, it would probably pay for itself, then start making money.