The answer to that seems straightforward to me. Is the 10mm making a comeback, or is it fading into obscurity?
How many makers are offering how many 10mm model pistols today? Is that number more or less than five years ago, or ten years ago?
How much 10mm ammunition is being sold today? Is that more or less than five years ago, or ten years ago?
The numbers would tell the tale, with no need whatsoever to even mention another caliber/chambering.
Without the numbers I would make the argument, from what I see, that the 10MM has made enough of a comeback that it is not in danger of fading into obscurity. New firearms and ammunition are readily available in 10MM from multiple manufacturers and multiple form factors (not just 1911s made by different companies).