France will just let it slowly deteriorate just like their fighter and bomber wings that are about 5% (or less) readiness.
None of them can afford to modernize their already pathetically weak forces because of the weight of their social programs and labor unions.
At least Britain maintains their dignity.
The state of French military finances is not so bad.
The force de frappe is the pillar of French national security, and it will not be allowed to wither.
Also, the French economy is growing. Slowly, but growing nevertheless. The current systems could stand to improve, but the country is not falling apart.