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I think we'll see non-clone coins being broken after two things happen:
1. They become valuable enough for attackers to bother, and there is some way for them to cash out.
2. The attackers have some time to do what they need to do to mount an attack-- write code, deploy botnets, hack into some big exchange(s), get their hands on some early-adopter's wallet backups, or whatever.
Once the tools and techniques are developed, then I think we'll see what we see in PoW 51% attacks: attacks against even mostly-worthless clonecoins, because if they've already got the tools then they might just attack for the lulz.
I'm surprised you count peercoin a PoS success-- they're still running with centralized checkpoints, aren't they?