Just wanted to highlight this part... attractive MARGINS.In the business world if you are forced to make a Sophie’s choice it generally means letting the uglier kid die. In practice that means the less profitable blend. So if Nightcap has relatively attractive margins and relatively significant volume then it’ll survive. If not, off to oblivion it goes. Note that while there’s almost certainly a numeric threshold relative performance plays a role too; this is where capacity (and other) constraints come into play.
Sometimes popular things get dumped and people don't understand why... popularity of a product is far less important than profitability, and margins play a direct role in profitability.
As I mentioned in the other thread, what does and does not survive and what does or does not change or how drastically it changes will be based on many factors, and this is one of them. It won't be purely on sales volume/popularity.
In other words, don't count on a blend staying or not changing much just because it's popular.