Do we still need email signatures?

An interesting article in Slate explores whether we still need email signatures.

The author argues that signatures are a hangover from writing letters, and have no place in the modern world.
But in 2013, when bots outnumber benefactors by a wide margin, the continued and consistent use of antiquated signoffs in email is impossible to justify. At this stage of the game, we should be able to interact with one another in ways that reflect the precise manner of communication being employed, rather than harkening back to old standbys popular during the age of the Pony Express. (Source: Slate)

At work I’m generally prone to using ‘regards’ or ‘kind regards’ as an email signoff. Personal emails to friends take the authors preferred form, with no greeting or signoff. What do you think?