When gas went up to $4+ /gallon, it didn't stop people from buying full-size, gas-guzzling SUV's. If you can afford a $40000 to $50000 vehicle, you probably ain't worried about keeping it fueled up.
Same concept here. People who can afford to play premium balls and equipment - they're not switching to a different ball because of a lower price, especially if that ball doesn't have a long history, and double especially if that ball is seen as inferior to the named-brand it's being compared to.
There might be an initial period where sales of popular midline balls like the NXT and Chrome Supersoft might see some softening, but I still don't think it'll amount to much long-term.
Golfers are a funny lot. They tend to stick with what has served them well in the past, especially if they can afford it. And if they can afford to play a couple times per week, then they're probably not worried too much about the price difference in NXT's or Chrome Supersofts versus what will be seen as a wholesale knockoff ball.
The Ksigs will indeed have a niche market, but I don't suspect it will be a game changer for the bigger named-brand companies who've been around forever.