Originally Posted by macca33

10-speed 5700 may trickle down towards Tiagra/Sora, in some shape or form, but spares / new-old-stock will reduce in availability over time. There will always be something around though - whether it is 105 / Ultegra / DA or Tiagra 10-speed, if one has an issue, or needs to replace a component, there should be that opportunity for some time to come.

cheers