Even though shares have skyrocketed in the last decade and a half, Netflix (NFLX -0.01%) hasn't quite panned out for investors more recently.In the last five years, shares of this streaming leader have been extremely volatile. And they've only climbed 51%, a gain that significantly lags the Nasdaq Composite Index. But where will Netflix be five years from now? Here's what investors should be thinking about when trying to come up with a forecast.Still the dominant streaming platformDespite a poor stock perfo ...