And therein lies the argument... that it would be cheaper to building in data-center redundancy into your design that it would be to ensure that your data center had 5-nines of uptime.
And if you're large enough to require 5-nines (or even 4) of uptime, you should be looking at data-center level redundancy anyway.
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If redundancy was cheap and easy, we'd do it even if we had reliable data centers.
It's not, and that's why we don't have it.
And therein lies the argument... that it would be cheaper to building in data-center redundancy into your design that it would be to ensure that your data center had 5-nines of uptime.
And if you're large enough to require 5-nines (or even 4) of uptime, you should be looking at data-center level redundancy anyway.