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There's no definitive evidence that changing the tensioner will prevent timing chain guide failure. However, the N20 and N55 used the same chain and guide. They didn't use the same tensioner. The N20 had problems, the N55 didn't. A year after the N20 chain was revised the N20 tensioner was revised. BMW must have had good reason for doing that. Pro-actively changing the tensioner before the guides are damaged may not prevent damage, but it's worth a shot, especially as it's not expensive. I haven't done it yet, I'm only at 24k miles, but plan to before I hit 30k.
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