Who is going to bother? Seriously, there are a few hundred machines at best and the OS doesn't support SMP yet. I don't see any reason why coders would do anything until one or more those facts change for the better.
I think it will all come down whether someone with know how finds a personal use and releases the software/schematics to the public. If you're doing something for you own benefit then you don't really care if no hardly anyone else uses it.
Someone has already written an X1000 MIDI driver for use with a homebuilt MIDI to RS232 circuit.
http://os4depot.net/index.php?function=showfile&file=driver/misc/camd_nemo.lhaObviously that doesn't use XMOS but illustrates the point.
@Jorkany
I don't think the XMOS chip is as big a selling point for most customers as it is for you. Personally I don't care if it sits there doing nothing forever because it was never a consideration in my decision to purchase an X1000.
It's also worth remembering that First Contact systems are not quite meant to be the final product. Maybe you should save the faux concern for when the final product is released with OS4.2.