I'd be interested in seeing something like "expected bitcoins generated/day" next to (or in place of) the khash/s number. I'd rarely need to see the khash/s number since that won't change unless I make changes to the software or hardware.
I think the web c alc does a good job by showing likelyhoods based on khash speed:
http://www.alloscomp.com/bitcoin/calculator.phpThat way you can see there is no guaranteed time horizon.