Nu is a clever system, but as soon as its details were revealed, it was obvious that it isn't going to have any direct impact on the PPC price. Sure, it will pay dividends in PPC, but that's not a net buying pressure. It could indirectly help PPC price by bringing new people into the ecosystem, etc, but paying dividends in PPC creates selling pressure (people cashing their dividends out) which exactly cancels out the buying pressure that comes from the Nu system acquiring the PPC in the first place.
I don't see why this would be the case. I think it's inevitable that many NuShareholders are also going to be Peercoin holders. Why would they sell? I know I wouldn't at least. And besides buying pressure, this relationship between the coins will help Peercoin in other ways. This quote is from a NuBits developer on our subreddit...
Peercoin holds a very important role in the design of NuBits. It is the incentive to build a better and stronger Nu Network. If Peercoin is not doing well then NuShare holders will lose out on their own incentive.
This will in time prove to be a beneficial symbiotic relationship between the coins. Improving the usability and utility of Peercoin is good for the NuShares holders as well.