It's good to have boundaries on fledgling relationships, and to communicate them. On one hand, I personally wouldn't have any problem with it. On the other, the potential for drama is exacerbated.
The fear of failure should be far from your mind when you're engaging someone with the desire to pursue them for a relationship. You don't start off a good foundation with cracks and creepers crawling through it.
Most people will avoid the drama because of the unknown or what they deem to be inevitable.
However, if the cards are laid down, and two co-workers are understanding of the risks, it could be pursued. It's an entirely subjective answer relative to each individual.
I'd also argue that the majority of people are going to tell you it is a fool's errand. And that's due to the excessively large number of workplace relationships that do fail.
To work back to boundaries; space is good for people in a relationship. If you are married it's good to have a break from each other. This is usually your work day, or your hobbies, or your relationships with friends, where you can relate to one another after being separate for various periods.
I've never dated a co-worker, but that's because most have been males. The few females I did enjoy at work were not worth the risks.