I doubt KnC are going to deliver on their September orders. They have 10 weeks to do what BFL did right at the beginning - put a big price tag on a chassis. I wouldn't feel confident buying based off a greyscale doodle.

So, I doubt there will be LTC ASICs by the end of the year. I also expect a LTC ASIC will be very expensive.

Anyway, to your question. It may not be possible for an LTC ASIC to mine LTC clones. But if it does, LTC will obviously mined the most. I except the clones to fade away.