Customizing ArcGIS Pro using addins vs python tools?

With the upcoming release of ArcGIS Pro and the eventual retirement of Desktop and ArcObjects does it make more sense to start new customizations in python or continue to use ArcObjects/addins for the time being?

I have a new project about to start that will involve a custom toolbar for desktop with about 10 custom editing tools. Previously I have always carried out such a project in .NET and ArcObjects. But now I wonder:

  1. Is the functionality now there to do this in python (At ArcGIS 10.1)?
  2. If I continue to use ArcObjects what is a resonable expectation on the toolbar life expectancy?

The current editing environment is ArcGIS desktop 10.1 and is likely to stay that way for the next 1 - 2 years.