They're primarily intended for overseas audiences (and doing very well in that regard--the pricing is very attractive compared to whatever else is available), and any US sales are icing on the cake, even though they're going to be significantly fewer here than of US prototypes.
That said (before anyone serves up the requisite bottle of "Hateorade" ) I bought a power/dummy set of SBB Cargo TRAXX electrics as a "demonstrator" set.
(not my layout--I was testing on a friend's setup before heading home with it)
I plan to use it with my train of spine cars when I finally get around to running it on my test track loop (currently out-of-service). If any of the high-speed trainsets (such as a TGV , Pendolino, Siemens Velaro, or a Bombardier Zefiro) were to be produced, I'd be sorely tempted to get at least one.
---PCJ