ICAO is a UN agency... I wouldn't bet on objective, data driven anything lol.

They will respond to the political and economic undercurrents. Since that involves multiple nations and multi-national business interests I can't even begin to guess at those.

But I'm comfortable about saying whatever they do is not likely to be influenced at all by pilots or unions either way. They will not raise the age to be "fair" to pilots. They will not fail to raise it because of unions, if that's what the movers and shakers want.