How this fits with common objections

[BCS]

Reiner Pope wrote:
> Furthermore, now is the best 
> time to make breaking changes, since breaking changes after 1.0 are a 
> big no-no.


Why?

I known the obvious an answer, but why not allow major breaking changes 
with major version changed? If the ABI is backwards compatible, then 
inter-version linking could be handled like D-to-C linking. However this 
would require continued updating of the 1.0 compilers and some way to 
tell versions.

I'm not saying this should be done, I'm just sort of thinking what would 
happen if it is.