Still, I strongly believe that, if we categorize a game which does not have first person camera as FPS, on the pretense that "but it has all the OTHER things", this is not a good place to stand as an industry.
...But the FPSes genre is defined by the perspective, not the content. You'd have a better argument if you talked about "shooters" and how the genre's been adapted to MMOs (Gun) and RPGs (Alpha Protocol).
The problem is that the defining characteristic of the roguelike is permadeath and randomly generated levels. Unless that changes people will keep calling games with those mechaics roguelikes. RPGs are defined by experience points and level ups in the same way. (Just to be clear this isn't an invitation for you to explain exactly what a roguelike needs to be. I read your explanation already)
I think there's a much better reason to not call the game a roguelike. The genre was
very popular just a few years ago so developers made a lot of them, which led to a lot of talking about them. The genre's popularity has cooled since then, meaning there's a small backlash against media coverage of all but the biggest games with stated Rogue influences, even though people still like playing all kinds of games with those elements. Not using the roguelike label could mean extra work to raise awareness though; it still a stronger genre than twin-stick shooter or shmup ever have been.