I think they will arise in some way.
It could happen similar to plane development-
1: Nations start using armoured cars for scouting. Maybe occasionally killing enemy infantry and being unable to be harmed.
2: Nations invent armoured cars for battling other armoured cars (i.e. bigger guns)
3: Nations add more armour onto armoured cars to stop this
And so on.
It could happen similar to plane development-
1: Nations start using armoured cars for scouting. Maybe occasionally killing enemy infantry and being unable to be harmed.
2: Nations invent armoured cars for battling other armoured cars (i.e. bigger guns)
3: Nations add more armour onto armoured cars to stop this
And so on.