You're overblowing a lot of those issues.
Water leakages don't cause service interruptions, and RTG (or rather, RTM) has to deal with the maintenance for the next few decades anyway.
The vehicles don't have reliability issues in the winter, it was a track maintenance issue (i.e. not enough plows) and it's been addressed.
Track issues in the yard aren't the same as track issues on the mainline, plus it was an error in switch operation that caused the derailment, not something inherently wrong with the track.
There isn't a "great" plan for service replacements. They can't keep a fleet of buses on standby (not after the first few weeks anyway) just to pick up service if an issue comes up on the line. I mean, what city does?