Yes, it'd be difficult. I have some faith that once things escalate far enough the people wielding the weapons are unwilling to murder their countrymen en masse.
Luigi Mangione has shown that all it takes is one person in the right time and place to remove some evil from the world.
It needs to happen, at minimum, before drones can reliably maintain themselves and kill dissidents in the street. At that point even if the human police and soldiers become disloyal it'll be too late; a society of two types of people, the one guy with access to issue prompts, and everyone else.
Greed makes no sense in a truly post scarcity society. There is no scarcity from which to take in a zero sum way from another.
Status is the real issue. Humans use status to select sexually, and the display is both competitive and comparative. It doesnt matter absolutely how many pants you have, only that you have more and better than your competition.
I actually think this thing is baked into our DNA and until sex itself is saturated (if there is such a thing), or DNA is altered, we will continue to have a however subtle form of competition undergirding all interactions.
That's only if greed is applied exclusively to real wealth. The reality is that greed is also applied to second, third, and even fourth order signs[1].
There is no end to semiotics, and therefore no end to greed. In this case, scarcity is artificial; created only via socially imposed monopoly. If we truly want a post-scarcity society, then we must abolish copyright.
Imagine you discover tech that ushers in a post-scarcity society. Let's say you make a replicator that can make anything from a bit of dirt.
Greedy people wouldn't even think about sharing this tech with the world, even though they could literally end world hunger. They will hoard it, and use it to make themselves more powerful and to kill anyone else who looks like they might discover it.
1. Universal Basic Income as we're on the way to a post-scarcity society. Unlikely to actually happen due to greed.
2. We take inspiration from the french revolution and then return to a simpler time.