Getting 1000 premium user's is quite possible, I just hope there should be a strategic plans that will gives premium user's some attractive reward on weekly basis, that's should serve as an incentive for subscription.
With this , we can get more user's to key into subscribing.
As long as you make 1-4 quality blog posts per month so @leo.voter can curate you, it should be super easy to make more than the cost of premium + have all of the premium features