I'm sorry but there are many, many other ways to test if people are interested in something. This is a horrible idea. Poll users, send out a newsletter and see

I'm sorry but there are many, many other ways to test if people are interested in something. This is a horrible idea. Poll users, send out a newsletter and see the response, post a link to a page telling them what's coming and see how many click. If no one clicks, then no one will miss out on this new upcoming feature that all of a sudden isn't coming.