You should have never been "In"!
Seriously I told you guys a long time ago NOT to support this console(360) and to get your get racing game fix on the PC. Now you're going to get burned with these Fanatec wheels not being useable on the X1.
The PC has and will always be the no.1 system to play racing games/sims. With pCars, Asetto Corsa, rFactor 2, F1 2013, GRID 2, iRacing, and a *shitload* of arcade racing games via emulation at your disposal, there is NO reason to get an Xbox One! None!
Come on over where the grass is greener guys. I promise you won't regret it.
Devil's advocate:
The grass might be green, but you have to plant the seeds yourself. Also, to play with others on the grass you have to make sure the other players have planted exactly the same seeds as you have.
Seriously, I used to play a lot of PC racing sims, but they all have something missing. From your list above F1 2013 and Shift is utter trash. Grid is hardly a sim. pCars and iRacing are certainly really good sims, but iracing's subscription and IAP puts me off. iRacing is tempting, but I am afraid I don't have the time to play as much to justify the monthly fee.
pCars is the PC racing sim I'm currently most interested in and have the highest hopes for.
IF Fanatec or MS shows a solution for using 360 wheels on the One Forza 5 will bring more enjoyment to more people than any PC racing sim ever can.