If you feel that Steemit is revolutionary and will be around in the next few years then invest dollars in Steem Power. If you're sitting on the fence and not sure then the best way is to create quality content and earn Steem Power. You'll be investing time, but not your own dollars.
I've invested both money and my time creating mediocre potato content. I think its going ok.
RE: Will Steemit be worth it by the time you take out your Steem Power?