Yeah, in general I wouldn't be opposed to moving away from mining equipment; it's going away from the existing pool (prohashing) more disappointing. I haven't had a chance to be watching the Nyanchain lately; is it running a bit better? I do think "Nyancoins PoW" is going to keep going. Someday I think it would be cool to have a "Nyancoins PoS" forked from it, and perhaps we could even update the difficulty algorithm to work a bit better, but I do think we ultimately just need good baseline mining equipment support to get Nyancoins PoW to work well, no difficulty algorithm can compensate for that.
I re-read your post and start to believe that a PoW/PoS hybrid should now be suitable for Nyan. It won't disappoint the existing pool, while can keep the blockchain running by PoS after each PoW hit-and-run.
The blockchain has been stable lately and has not had any hit-and-run attacks that I have noticed. I am still not interested in championing such a change and do not think it would be uncontroversial. In particular because PoS usually expects to get a reward as well, and I'm not going to fuck with the 337 million coin cap; that's a core feature. I am not planning any hard forks of any kind until NYAN3, which I expect no earlier than 2016Q4, and I don't plan anything controversial for that (any convenience changes we need, and hopefully something like a 2MB block size limit just to show we can, even though I've never seen a full block on the Nyanchain).
I am not suggesting to change it now either. I just believe PoW/PoS hybrid should be a good choice when we need to change.
Perhaps we can reduce PoW reward and provide a relatively small PoS reward to keep the coin cap.
There is no hit-and-run lately because Nyan is not so hot right now. But it doesn't mean we should not prevent hit-and-run from happening in the future.