You should try running bloom on a repo with that many packages. You will be waiting a pretty long time to do that one release… (I am every time bothered by the time it takes to do a release of ros_comm which has less than a quarter of the packages.)
And if you then notice that one of the 131 packages needs a bug fix release for a single line change but you have to release all 131 packages again (each except one with an empty changelog). And every user will have to download 131 new Debian packages 
Of course you could tweak bloom to support releasing subsets of packages from a single repo. But realistically is anyone interested to put the effort into doing that?