No amount of investment can buy customers if your product itself can't earn them. And with customers, funding follows easily. Customers, then funding, always.
Instead of attempting to project so far out with ambitious designs, consider releasing more limited versions of your product in waves over the course of the same time period. That way, consumers can have access to the product sooner rather than later.
Most people think that the Peter Principle (employee rises to his level of incompetence) only applies to large organizations. Let me assure you that it is also alive and well within start-ups.