Could just be life.
At some point you have time decide how much time you think you have left and how you want to spend it. I just sold off my gold 1971 Plymouth SSP as I honestly didn't see myself driving it in the near future. Bunch of other stuff being cleared out too.
Even getting the Reliant back in track form is going to be a stretch for me, lots on my plate. I have tinkered with finding a "twin" and building a semi-clone for fun but this has proven fruitless as most candidates I have located are too far away or rotted. So it will go to Brian and we will see what can be done.
Even if the Reliant is back up to speed next year there is still a Dart that has been waiting since 2012.. The GTX will be converted back to 4-speed and power steering after its next track outing... I still have 4 windows in the house that need replacement..
Time.