Fat WCMM, Should I Worry?

It's all good, as far as I'm aware.
My WCMM are the same and have been so since last year. The females are still rounder, nobody has spawned in the temperate tank (thankfully as I don't really have room for much more), and everyone is eating and acting as normal.
I don't think fish get egg bound like reptiles, and I think a lot of female fish are more rotund than the males.
I'm sure one of the more experienced keepers will provide some more detailed information if there is anything you need to keep an eye on, but no long term health issues if fish don't spawn.

By the way, what reptiles do you have? If you want to post pics and give some info in the "other pets" section that would be great. 

To be honest, if they do spawn you are very unlikely to be inundated with wcmm. The eggs will be eaten almost as soon as they are laid, and if any fall into somewhere inaccessible, the fry will be eaten as soon as they swim out into the open as egg layer fry are very tiny. If you want to breed them you have to do things like spawning them in a nursery tank then remove the adults as soon as they've spawned and raise the fry separately until they are big enough to avoid being eaten.
My rice fish and peacock gudgeons spawn all the time and I don't have baby fish in the tank. Well, except for 4 juvenile rice fish and the only reason I have them is that I moved a plant with eggs in it (didn't know they were there) into my betta's tank and he is so old he didn't bother with them. I'm not even sure he could see them.

I forgot to mention that the water being warmer than the minnows prefer won't stop them spawning ......

I had wcmm several years ago. I bred them in a small tank kept just for this and moved the adults back into the main tank when they'd laid their eggs. I kept the main tank at 25 deg because of the other fish, and the spawning tank also at this temp so it was the same as the main tank. They had no trouble at all spawning.
The main problem was feeding the fry so most of them died 

I now know that wcmm need temps lower than 25 deg but I didn't back then.

but with the amount of information available on the internet, getting a definitive answer about what they do need can be difficult.  I've seen anywhere from a max of 21 to 24 degrees

There is indeed a vast amount of info available on the internet - it can be difficult to differentiate the wheat from the chaff. Fishbase and Seriouslyfish are two excellent sources, in addition to our own Thinkfish website's Fish Profiles, and are updated regularly - http://www.fishbase.org/summary/4758 and http://www.seriouslyfish.com/species/tanichthys-albonubes/

Thanks fcmf.

I do tend to use SeriouslyFish a lot for the 'sciency' stuff and found some good info on Fishlore.

Looking at all three pages for the WCMM none of them completely agree on certain parameters:
Fishbase:  Temp- 18-22
                 Ph- 6.0-8.0
                 Numbers- 5+

SeriouslyFish:  Temp- 14-22
                        Ph- 6.0-8.5
                        Numbers- 10+

ThinkFish:  Temp- 14-24
                   Ph- 6.0-8.5
                   Numbers- 4+

All slightly different so it's a choice of picking the one that suits or take an average (hence 23 degrees and 8 minnows)!!  But that's just the Internet for you.