If the EIR becomes a reality, I wouldn't be surprised if the FAA followed suite at some point. They are very keen on harmonisation and EASA commonality these days. Last years "line up and wait" etc, etc.
Why on earth would the FAA copy the EIR? Their existing full IR is achievable in less time and with much more relevant and proportional theory content. I can't believe that would happen.
The EIR may make some sense in some cases in Europe, particularly for IMC holders, but a more achievable CBM IR would be a better option.