You can't get rid of BlinkFeed entirely. You can deselect all fields which will make your BlinkFeed bare. Also, it must be one of your home screens.
This isn't a huge deal but I deem it a mistake by HTC. I gather that BlinkFeed by default will be your home screen. You'll have to make the necessary changes to make the feed empty and to remove it as your main home screen. (However it's still one of your screens.)
I see two issues here. The biggest one being that people will walk into a store, not like BlinkFeed, perhaps not realize or ask a sales rep if it can be removed, and will not purchase the One for this reason alone. Two, not being able to remove it entirely from your home screens is a huge mistake by HTC.
Instead they should have made it one of your home screens by default, not the main one, and allowed the option to disable it entirely from your screens.
Whoa what? You can't disable it? That's silly.