I know some love the 10mm and that's great, I really like the .41 Magnum and that's another reason I don't see a need for the 10mm. The .40 covers any and all social needs and the .41 covers anything beyond that. Power wise the .41 Mag is far beyond a 10mm, which as bad as some would hate to admit, is much closer to .40 performance than .41 Mag performance, but I get that it sounds better to compare it to a .41 Mag, it's just not a good power comparison. My take on it, and again I have no hard feelings towards the cartridge, is that the 10mm isn't worthwhile, but that's just my .02.
It's not easy to do an apples to apples comparison with 10mm vs. .41 mag
Yes, .41 mag can achieve about 35% more energy than 10mm (790 FPE vs. 1070 FPE), but needs a 6"+ barreled revolver to do it. Beyond, but I wouldn't say far-less disparity than top 10mm vs. top .40 loads, in fact. Now reduce the .41 to a revolver in the size range of a 4.5-5" barreled 10mm (that's a 2.5"-3" revolver), the gap all but disappears. More to the point, there is no .41 mag that holds 15 or more rounds. The Witness, Para Ordnance and Star Megastar take 15+1, the G20 up to 17+1 with mag extension. For just about any practical purpose, given the option of a 15+1 10mm or a 6 shooter that is wider, longer and heavier, that's simple math to me. I'd have to step up to .44 mag to make it a tougher call. Which, BTW, in my 3" 629, my top .44 mag loads barely outclass the 10mm from the 4.6" G20 or my 5" guns in terms of muzzle energy. More blast, flash and recoil, but not much more terminal performance.
In addition to that, the 10mm may not be all that mainstream, but is much more popular than the .41, making brass and loaded ammunition availability favor it considerably, as well as ammunition cost, particularly where practice/plinking/range ammo is concerned. I don't know that you can even find loaded .41 mag for less than $1/rd, usually closer to $2.
This is not meant to "dog" on the .41, but we need to be honest about what it is and isn't, and level the playing field as best we can where platforms are concerned to fairly compare ballistics. 6"-8" barreled revolvers are a whole different class of firearm than service sized or compact autos. I get 1,342 FPS from my 3.5" barreled Witness Compact 10 with 180 gr. bullets; a .41 mag that fits in the same length box would have about 1" of barrel, be burning more powder outside than in, and still have half the capacity.