This is pure astroturf. There are dozens of solutions already for this, not to mention most corporations you can just view someone's calendar and pick a time whenever everyone is available.
Most of the solutions I'm familiar with require all scheduling parties to be on the same Exchange Server with calendar busy/away shared. Or you have to click-thru to a website and then deal with creating a user account.
Using email seems like a nice friction-free way forward. I hope they get traction!