While that's an idea, it's not going to be implemented any time soon. I'd much prefer to see wormholes tweaked to fit the currently-existing game than broken to fit something that may come months or years down the line, if at all.
Regarding capitals in wormholes itself, I think we need to see how the structure meta evolves before we declare capitals welcome or unwelcome in low-class holes. We've barely had a chance to see Citadels and no chance to see the other structures CCP is promising. If it turns out they can be min/maxed to make wormhole assaults difficult verging on impossible with a small group of subcaps, for instance, I see no reason why capitals should not be brought up as a counter to this.