well, tricky question.
The 1.1 Nokton will certanly push the other used Noktons down in price - specially when it will start to hit the used market. And most likely the Canon's as well.
Problem is it will take some time for it to appear in the used market reguarely so it drives the other noktons and canons down, so I would say 3 to 6 months.
The 1.0 Noctilux's vs the 0.95 vs 1.1 Nokton is very complicated and constrained with lots of factors.
I said over and over the 0.95 is a much better lens overall than the 1.0 that that improvement came at a cost : the bokeh. And that swirlly crazy bokeh is e-x-a-c-t-l-y what made the Noctilux famous.
So I expect to see few users dumping their 1.0 to trade up for the 0.95 but I can see the 1.0 ( if the 0,95 is not that good in the bokeh department ) bumping in price again.
Very few users will trade in their 1.0 Nocti's for a 1,1 Nokton, if at all. Yes, it would make perfect sense, Nocti's are specific tools for specific times so it would make sense to trade a 4 or 5k lens for a 1k lens that does almost the same since its used not so often.
Many people use this logic but I have YET TO SEE ONE SINGLE NOCTI USER to say that logic.
First problem : since when buying a Noctilux, new or used, is a logic buy ?
Its heavy, has focus problems, can't be used all the time, filters are expensive, upsets teh balance of the M camera, its expensive even in Leica terms.
So why a insane ( all of us, Nocti users, are ) Notilux user will trade their Nocti for a Nokton ?
I wont.
The Nocti is the Leica White Unicorn. Its something you have to do.
Ex-Nocti users might be tempted to buy the nokton, that I belive.
But current ones, I dont.