Wanting too much.

Since arriving at this point in my life, I have frequently pondered the idea of wanting too much. Not in the sense of being greedy, but wanting something specific too much. Perhaps a better way of explaining this notion is pinning all your hopes on one thing, planning your life around a single hope or desire... Is it a good way to live? If we live like this are we forcing events and experiences that need time to develop and materialize? Will we always be disappointed because, nine times out of ten, it seems, when we live in expectation of one desire it fails to happen? Or worse...if it actually happens, it fails to live up to our initial expectations and is thus as equally painful and disconcerting as said thing not happening at all.
It is hard to wait around for something, you know might never happen, to happen (while trying to lead and live an enjoyable, productive life) but, one might argue, it is even harder to give up on such hopes entirely, knowing that the acquistion or realisation of your dreams will transpire to be everything that you want and/or need. This being said, how long should one wait? Days? Weeks? Months? Years? I suppose that it varies from dream to dream, desire to desire and the individual nature of your wants but, if it is something that you cannot actively plan for, pursue or work towards, what do you do? How long should you wait before abandoning what may seem like naive fantasies or unrealistic ideals?
Perhaps there are no answers, or maybe there are no concrete answers. Maybe, when one returns to reality, the process of coming back down to earth will cause us to reassess or perhaps we will be further inspired, invigorated and lifed by a sense of stubborn pride that, actually, we were right all along to stick to our guns and, once again, it is surely only a matter of time until that pivitol moment where all the pieces in life's great jigsaw fall into place.