Full Idea
In the end Leibniz dethroned Aristotelian continuants, seen as imperfect from his point of view, in favour of monads.
Gist of Idea
He replaced Aristotelian continuants with monads
Source
report of Gottfried Leibniz (Monadology [1716]) by David Wiggins - Sameness and Substance Renewed 3.1
Book Reference
Wiggins,David: 'Sameness and Substance Renewed' [CUP 2001], p.85
A Reaction
I take the 'continuants' to be either the 'ultimate subject of predication' (in 'Categories'), or 'essences' (in 'Metaphysics'). Since monads seem to be mental (presumably to explain the powers of things), this strikes me as a bit mad.