Hey Ben!
While we do not have plans to add Calendar sync to other training platforms such as TrainingPeaks, we are working on the ability to export your calendar to your Google Calendar, iCal, etc. I know this does not gain you any predictive analytics, but it will help to fit your training into your personal schedule.
Adding Run/Swim import features is on our Development Roadmap. We have a few major projects before we begin this development, but it is something we very much want to do. You can throw you +1 in on this thread if you’d like to show your support
We don’t have plans to integrate Fatigue/Form metrics into TrainerRoad at this time. We feel that managing all of these complicated metrics should not be something that our Users need to do if we are creating the Training Plans properly 
For that reason, our future developments will be focused on making the training plans even better than they already are, and making TrainerRoad a more powerful training platform. Our goal is to make it very straightforward for any athlete to get faster 
Thanks so much for taking the time to share your feedback!