Simply showing up and saying you can migrate data from one into the foundations of another doesn't at all sustain any sort of argument that a distributed Facebook Status model will "kill" Twitter. The modus operandi is drastically different between the two sites. Twitter isn't a "feature", it's a "service", a highly extensible and mobile service. The fact that it is focused on such a simple protocol as telling people what you are doing, imo will ensure its longevity.

Given that people look at Facebook statuses as a mere extension of a user's profile, versus a Twitter timeline actually serving as your profile, simply distributing your Facebook status on a web page isn't going to phase Twitter one bit.

And I still stand by what I said earier: Facebook and Twitter users aren't the same. Mark might update his status on Facebook "Mark is at the ball game" but on Twitter, he'll probably say "Local sports team is up by 4! Go team!". The inherent purpose and utilitarian value of the two sites are completely different for one to arbitrarily overthrow the other, just because the one (Facebook) mimics the distribution of the other (Twitter)