Realistically speaking, what is the likelihood of the Breakthrough Starshot mission being launched?

The one involving a thousand nanocraft propelled by light sails, which will hopefully send back data of Proxima Centauri and Proxima b (super earth). I read it could potentially launch in 2036, but is it more likely that this mission will be another Project Deadalus?
Update: @Jeffery, actually they plan on accelerating the nanocraft to about 15-20% the speed of light, so data will be sent back in approx. 21.2 - 28.3 + 4.24 years.
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