But they're MF only, which does restrict their appeal to a relative minority of users. I'm not sure that people are willing to give up AF, regardless of how good the glass is. This problem is not made any easier by the fact that Nikon glass is already very, very good in most cases (the primes and pro line, anyway).
Add the fact that MF is just nigh on impossible on a D50/70 to any decent degree of accuracy due to the small viewfinder (let alone to a critical level as required by macros etc), and I reach the conclusion that they're not going to sell those MF CZ lenses in any big quantities.
However, given that they were never a mainstream brand to begin with, I doubt they were aiming for huge sales either. It might work out quite well for them, because at least the huge market share of Nikon will provide a good platform to increase the volume of sales by quite a margin.
(PS. I personally think that Sony using the Carl Zeiss brand name for their lenses is more of a marketing gimmick - true, they may be CZ "designed" lenses, but what makes CZ special as much as the simple optical formula is the extreme precision to which they are hand-ground and crafted, giving incredible wide open performance (which is where you really need the top glass). You're not going to get all that on a P&S because 1. the lenses are far smaller in the first place, and 2. the lens build quality/craftsmanship is not applicable to lenses that are inside a P&S camera anyway.