Aiming for top 50k apps. Anything less than supporting all the apps I use simply diminishes the value. I don't need to switch to a less valuable device.
The type of people who value less closed systems are also those, as a group, with a wide range of needs. If I value my privacy and am willing to use less popular devices, why would I then be willing to use the most popular apps?
What I believe the ecosystem needs more than another device are apps that provide features available in the popular ones, but with the least possible amount of information gathering or sharing.