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"is theirs" is correct and usable in written English.
You can use it when the subject is unclear or unknown. For example, "They have the key, but whose house is theirs?".
Dictionary
is theirs
pronoun
That which belongs to them; the possessive case of they, used without a following noun.
Exact(47)
The decision is theirs".
The world is theirs.
What is theirs?
The conversation is theirs.
The floor is theirs.
It is "theirs, not ours".
Similar(13)
Their bodies are theirs and theirs alone.
Their thoughts are theirs.
"Their decision to retire was theirs alone".
He was theirs.
The cup was theirs.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com