Is it time for D1 to die of natural causes?

[Don]

Justin Johansson wrote:
> Now that Andrei's much anticipated publication of TDPL is out, is it 
> time that D1 should now perish?
> 
> My personal feeling is that by cremating D1, time and effort can then be 
> better expended and focused on solidifying D2.
> 
> Cheers
> Justin Johansson

I estimate that D1 has at least a year before it becomes "the legacy 
version". In any case, there's not much effort going specificially into 
D1 at the expense of D2.
But it's probably time to change statements about D2 being an unstable 
beta version, and we should start to encourage newcomers to use D2 
rather than D1.
In particular, we should make sure that tutorials and documentation 
should be updated to D2, or else clearly marked as applying only to D1.