I'm curious what these growth sectors are? Are you referring to software companies? Because though I agree that's a growth sector, it's hard for me to envision how many jobs that creates in the long run. Wouldn't it create the same problems as manufacturing, i.e. it's cheaper to outsource or automate so its job pool will shrink over time? Resources and manufacturing are real, tangible things that have real tangible value. Services, though the natural growth of an economy it seems, are fleeting and easy to do without when things go wrong.
I agree that we can't lean and need to encourage a diverse economy, but I would also argue that investment in any area is a gamble, and gambling is hard for a government to do when under constant public scrutiny.