Why don't a lot of players get drafted in their Minor Midget year? Jared Steege was passed over, got drafted at 17, now he's about to take part in his 4th OHL playoffs. Oliver Castleman.... Cole Carter... those are three guys right there that were passed over but were taken the following season. Oh and how about guys like Claude Giroux.... Paul Byron.... they were passed over completely and chose the QMJHL instead.
If you get selected then you get selected, if you don't then you don't. The hard part isn't whether or not you are selected, it's the work you put in after the fact to get to the highest level you are capable of. Development path is different for every player. It always helps if you are north of 6-0 and 200lbs, especially with the OHL. Easy for scouts to see size and strength, it's the intangibles such as skill and hockey sense I think they miss more often then none, at least on the first go around.
Long story short, if you get drafted nicely done, next step, work your butt off. If you don't get drafted, it happens, next step, work your butt off.
Using the OHL Draft to fully measure our hockey talent in Ottawa isn't the right way to look at it, it's obviously part of it without a doubt, but it shouldn't be used like a make or break like it is, that is a ton of pressure for a 15-year old kid.