I think generally the goal is by the time you have b-school types working in your start-up, you have built a strong core for your business, which shouldn't be c

I think generally the goal is by the time you have b-school types working in your start-up, you have built a strong core for your business, which shouldn't be changing that rapidly. However, it is good to be continually iterating looking for ways to expand or capitalize further on your core. If there is no core, established model behind what you are doing and you have a bunch of employees at the company (especially b-school types), I think it is reasonable to be concerned and perhaps consider other options available to you.