The consequences of this change are that 5.5 is effectively end-of-lifed.
Without MakeMaker or Test::More support most modules cannot be installed.
Eventually modules will start to use new features of Test::More and MakeMaker
and 5.5 users will be unable to upgrade.  The upside is that this de-facto
releases everyone else from having to support 5.5.  If one part of the chain
won't work there's no point in putting effort into the rest.