That's not an easy question to answer. I have never heard of the chains snapping but chains do wear and stretch over time. Personally, if I were spending the kind of money you are going to have to to replace the tensioners I would do the chains. This probably sounds obvious because that's exactly what I did.
If the extra work and time involved is a problem then I think I would take into account wether the chain slides had failed or not. Sometimes when the slides break up, the chain can end up running over the metal part of the tensioner grinding the tensioner away. If I saw any evidence of this, personally I would fit new chains.
At 200,000mls though, I would just do em.
When is your timing belt next due? Maybe you could do it all at the same time.
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Audi S8 D2 2002 88k mls
Ebony pearl effect black. Grey interior.
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