I agree with the view of keeping the images small.I propose a project to identify missing libraries as they are needed and to download them on demand.
This would be a wonderful feature for any release, and shouldn't be terribly difficult to implement for those who know the ins and outs already ( i.e. .. not me :-( ).
Also keeps the installed footprint smaller, and permits potentially much smaller download sizes.
Just my $1.42 --The loon