Of course not, there are drop shippers that die, go out of business, change their minds, and underperform in terms of value. You should do EVERYTHING in your power to prove it does work, that's the best way to think about it. Then you'll actually feel motivated to work towards that goal till you achieve it, as you'll always be thinking about what will or won't work. Studying your market and plan carefully is all that is required to make a start somewhere.