In fairness Dallas is a good example.
They have the best O-line in football and a genuine elite left tackle. They spent three first round picks on their O-line.
And Tony Romo has missed the best part of two consecutive seasons due to injury.
On top of Cleveland having used FIVE quarterbacks this year even with Joe Thomas, it does prove that a top LT doesn't stop a QB getting injured. And in the case of Wilson -- neither his ankle or knee injury was the fault of the left tackle anyway.
Essentially QB's get injured in football. All of the top QB's have missed considerable time or suffered serious injuries -- Brady, Manning, Brees, Flacco, Big Ben, Luck, Rivers, Palmer, Stafford, Rodgers, Bridgewater, Cutler.
Wilson hasn't missed a game yet in four and a half seasons.
It's actually unrealistic, considering the list of names above, to expect he wasn't going to get hurt in his career.