This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Quality or state of being obsolete or unused.

n. The state of being obsolete, or no longer used; a state of desuetude.

n. Indistinctness; want of development.

n. The state of being obsolete or out of use.

n. In descriptive zoöl., the state of being abortive, or so imperfectly developed as to be indistinct or scarcely discernible.

n. the property of being out of date and not current

"So one is left to wonder why this digitization project came to such an abrupt halt and if progress towards its development will begin again at some time, or if it will simply be left as it is and fade into obsoleteness, depriving users of such a unique, extensive, and informative resource. at"

oldness   

indistinctness    obsolescence