Right now, what's the most important for the success and adoption

[Jason House]

1. A single standard library or, at a minimum, interoperability between standard libraries

2. "One click installer" for the trio of compiler, standard library, and build tool. (does not exist yet)

3. Support for Windows, Linux, Mac, 32 bit, and 64 bit at equal levels.
(Mac and 64 bit are currently lacking)

4. Active support for standard libraries and build tools.
(This is why I'd vote for Tango as the standard library - everyone admits that Walter is busy working on D instead of focusing on Phobos)