The hard reality is you're not going to know if you're successful for five or seven years, and that becomes a problem. You're betting the chips on something that you're not going to know if it was successful or not for seven years. In the meantime, it doesn't mean you can't have various markers on which to start measuring that success. It could be job creation, licensing, whatever, but the honest truth is you're not going to know for a while down the road.
On June 15th, 2017. See this statement in context.