If Fuji ever makes an X100 with a 50mm-equivalent lens (probably a 35mm f/2), they'll sell a boatload. Quite a few of them will sit on a shelf, though, compared with the 35mm-equivalent X100s of today. You can always crop in, but you can't crop out.
If Fuji did make a 50mm X100, though, I'd be on the list. Ricoh made a great choice by bringing the GR IIIx to market. If I ever jump on the GR train, it'll likely be with that 40mm-equivalent model. Less versatile, but the images that do hit will resonate with me more.
I have the TCL -- it does work well, but it is so large that it feels very un-X100-like. When I travel with the X100, the TCL comes along, but as a "sometimes" lens, rather than the default.
If Fuji were to come to market with a leaf-shuttered 35mm f/2 comparable in size to the X100's 23mm, I continue to maintain that there'd be a bunch of high-end buyers. It'd be the only 50mm-equivalent instrument of its kind on the market.
I've spent some time with a full frame Canon SLR with a few different fixed focal length lenses. (35,50,&85mm). My favorite lens is the Zeiss Distagon 35mm/1.4 even though it doesn't have autofocus.
That being said, I have moved to the Fujifilm x100v and I'm happy with the results.
If Fuji did make a 50mm X100, though, I'd be on the list. Ricoh made a great choice by bringing the GR IIIx to market. If I ever jump on the GR train, it'll likely be with that 40mm-equivalent model. Less versatile, but the images that do hit will resonate with me more.