I imagine that Perl will continue to support the old behaviour by default and an explicit use 5.xxx statement will enable the new behaviour via feature. (Much like how use 5.010 enables state, say, etc.)
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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