What is the most valuable challenge for Debian in this Stretch cycle?

• restructuring website as 21st century style and drop deprecated info
• automate test integration to infrastructure: piuparts & ci
• more test for packages: adopt autopkgtest
• "go/no-go vote" for migration to next release candidate (e.g. bohdi in Fedora)
• more comfortable collab-development (see GitHub's pull request style, not mail-centric)
• other

Your opinion?