Let's say you delivered packages using a horse and buggy, and people started talking about this new fangled "automobile" thing. Sure, you could try to dive into it and use an automobile for your next delivery. And when you crash the thing and your delivery isn't made, you get pissed off and say "I'm never using an automobile again!"
Or.. you could keep using your horse and buggy at work, and start learning the automobile in your free time. Then, once you've mastered the automobile, start using it at work.
But I'd disagree with the advice of learning vim a little bit at a time. It may be necessary to do that if you're trying to learn vim at work, but most people will acquire bad habits that way and learn to use vim in a watered down way. You've now tied some reins to the steering wheel and are sitting on the automobile's roof, trying to reach in the window and whip the gas pedal.