The proposal only make sense if the number of released arch drop down significantly (say to 4 archs).
There are 12 architectures currently that could easily meet all the criterions that are fair. The 2 "unfair" requirement being "available for purchase new" and "at most 3 buildd" (i.e. must be very fast).
If you remove these two "unfair" requirements, you have 12 architectures to release and the proposal is a no-op.
Even with the two "unfair" requirements, it is not clear that you will go below 8 archs.
A lot of powerful hardware has been given to the project but is not used as buildd because the ftp-master don't feel the need and so don't take the trouble to set it up.
For example arm is certainly 'available for purchase new' and Debian could use arm box much faster than netwinder as buildd.
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