What's the future of Growth Marketing? Do you view it as eventually splitting out from 'Traditional' marketing practices such as Product and Brand?

That's such an interesting question. Over the last 5-10 years, I've seen multiple organizations split Brand/Traditional Marketing from Growth Marketing. While that creates focus and specialization, it also creates a confusing and disconnected user experience. Organizations have started to recognize that and correct it by merging growth and marketing back together to optimize for alignment and consistency in the user funnel. I ultimately believe organizations will merge back together, and that Marketing departments will have to adopt quantifiable growth goals in addition to softer brand goals. 

So, if you want to be successful in marketing, no matter which function, figure out how to measure the impact of your function.