One of the great things about the Vorta was that there were only like five of them, and they kept showing up, particularly Weyoun. This, of course, was due to the peculiar nature of their species, a group cloned from a few production lines for missions specific to their genetically-granted skills. Also apparently some of them were telekinetic but let's ignore that.
Now, the Jem'Hadar were essentially in the same boat as the Vorta. They were all clones, all genetically engineered for a particular purpose, and yet... they displayed differentiation to a degree expected from a sexual species. Different heights, builds, features.
Were there thousands of Jem'Hadar production lines? We can only presume so, although to what end is not apparent.
Personally, I think this was a missed opportunity. Limiting it to a few Jem'Hadar production lines would have allowed a recurring Jem'Hadar character or two, and let us get to know them the same way we got to know Weyoun and Keevan. The dramatic possibilities of a Jem'Hadar who will always be a Second except in the brief period between the death of his First and the arrival of his identical replacement, would also have to be reckoned. It would've been quite cool to have, say, Ikat'ika reappear from episode to episode. Even after he was executed.

Now, the Jem'Hadar were essentially in the same boat as the Vorta. They were all clones, all genetically engineered for a particular purpose, and yet... they displayed differentiation to a degree expected from a sexual species. Different heights, builds, features.
Were there thousands of Jem'Hadar production lines? We can only presume so, although to what end is not apparent.
Personally, I think this was a missed opportunity. Limiting it to a few Jem'Hadar production lines would have allowed a recurring Jem'Hadar character or two, and let us get to know them the same way we got to know Weyoun and Keevan. The dramatic possibilities of a Jem'Hadar who will always be a Second except in the brief period between the death of his First and the arrival of his identical replacement, would also have to be reckoned. It would've been quite cool to have, say, Ikat'ika reappear from episode to episode. Even after he was executed.