Setting aside the modes altogether - if there is a 200% increase in Player traffic in a system (regardless of mode they were in), then I'd like to see a 200% increase in NPC traffic (for ALL modes - not just solo).
Whilst I have no real issues with your proposal a few posts ago, the above quoted might cause some issues. If you're in a starter system during a sale, then you're going to see lots of traffic in Open, then doubling that traffic with NPC will just cause either the servers to melt down, or people on slow rigs to really suffer. For your suggestion to work, there has to be an upper limit, just to keep the game playable for the vast majority.
Now I have no interest in PP, but seeing more NPC's would be quite fun to see, especially if it was connected to some Galnet story. Anyway I am out in the black at the moment and have no idea what's going on in "civilised space", but hoping to see some changes from 1.4 that either incentivises PP (to the point I am interested in playing), more depth to missions, more CG's, otherwise I'll be on another trip out waiting for 1.5.