I also love the LAV-75 but I really think you'd only see them as Rae has said with the Stingray's
M35 LRF 105mm.
However I don't think they'd make any more of the vehicle because the
"Expeditionary Tank" is almost exactly the same and it uses the same turret as the Stryker. They'd probably build those if they needed that specialist vehicle.
I can still see legacy LAV-75 vehicles being put into a Stingray unit though if they suffered losses. In that case divisional workshops simply rebuilt the existing LAV-75s to M35 spec.
In fact it'd be appealing to have a whole Stingray Brigade with rebuilt M551 hulls in one unit and LAV-75s in another.
One thing that might appeal to desperate commanders when pondering whether it was worth the resources to activate this mishmash (the Nazis did worse late in The Second World War) is that the very light vehicles would use far less fuel than a normal tank brigade.