Would France and Italy accept larger treaty cruisers?

Why would France and Italy be content with an agreement allowing larger cruiser hulls?

They primarily wanted parity with each other; if both could build larger cruisers, both were likely to do so.

If treaty rules permitted larger hulls, both navies would likely use the allowance rather than voluntarily remaining smaller. French and Italian planners measured their cruiser forces primarily against one another. Building more small cruisers remained possible, but neither side had shown a consistent preference for that choice over matching individual ships. A larger displacement limit would therefore shift both design programs upward without resolving the underlying bilateral rivalry.