The Roubaix will get the vast majority of the foreseeable miles, pretty much ALL of the miles where a "sports car" bike gets the call, which is most of them.... this new bike has a pretty clearly defined mission, albeit two pronged. On the one hand needs to be something that hauls some crap pleasantly while still being something I can lock to a lightpole in town. On the other hand, it needs to go get wet and dirty in the winter in the countryside on 30-40 mile winter rides. I don't ride in the rain per se but wet pavement (and just bad luck) mean wet grubby gritty rides... I did a number of those on the Roubaix this year but the heck, might as well spare it in the future.
Thats the thinking, such as it is. I reserve the right to be wrong.