This has probably been posted before in this thread (did not read fully), and also posted in the other threads.

http://store.steampowered.com/hwsurvey/directx/

Maybe I'm wrong, but I think over 50% is the majority. I mean, that's what I was taught in kindergarten.

The CMs need to forward hardware survey sites to developers so they pull their heads out of their asses.

Facts people put together:

1) A DX10 capable card is required to run the game at playable framerates
2) Steam, the biggest digital distribution service in the world, records over 50% of the computers it's installed on to be DX10 capable.
3) Windows 7 dominates the OS market, capable of DX11.
4) Windows Vista, capable of DX10, was upgraded to support DX11 shortly after 7's release.
5) DX10 is 5 years old. Was FFXIV really in development for over 5 years? Considering the amount of re-hashed content, I highly doubt it.
6) You can make different clients for different platforms. More development time, yes. Better experience for all of your CUSTOMERS, absolutely.

/mind trails off