Full Idea
If one regards the usual form of quantification into modal and other intensional contexts - modality de re - as legitimate (without special explanations), then one seems committed to some form of haecceitism.
Gist of Idea
If quantification into modal contexts is legitimate, that seems to imply some form of haecceitism
Source
David Kaplan (How to Russell a Frege-Church [1975], IV)
Book Reference
'The Possible and the Actual', ed/tr. Loux,Michael J. [Cornell 1979], p.219
A Reaction
That is, modal reference requires fixed identities, irrespective of possible changes in properties. Why could one not refer to objects just as bundles of properties, with some sort of rules about when it ceased to be that particular bundle (keep 60%?)?