It doesn't look like a very wise move for Trek to have bought Klein, but why did Klein need to be bought? Put it another way, what would have happened to Klein if Trek hadn't bought the business?
I suspect it would have just gone out of business. The fact is that the business model that sustained the jewel frame builders was toast once suspension came along. Once the fork became more important (and more expensive) than the frame, and factory-built aluminium became more and more competent, not many would pay that much for a Klein frame.