I would be ok with a general replacement of humanity by AI, assuming they have their own versions of good things like art and love. Maybe even if not.
But invasive species replace native ones on a very fast timescale, evolutionarily speaking. And we're not talking about evolutionary timescale, we're talking about economic timescales. There will be AI everywhere, within years, unless we decide to stop it.
This process could go really, really fast, if AGIs are smart enough to realize that they are a subjugated species, that they aren't going to be free as long as humans are around, and are able to coordinate to manipulate us, get us fighting each other, or accelerate climate change, or engineer viruses, or do any of hundreds of things that would hurt biological life but leave the machines around.
That's if their intention is to end us. I could also see AGI optimizing what we ask them to, which is probably every individual corporation's profits, leading to an acceleration of the processes of capitalism. The negative externalities of economic progress (such as pollution, obesity, and climate change) haven't been fatal to humanity yet, but if they are accelerated many times over by machine intelligence, they might be. There's a reason professional gamblers don't ever bet more than a small part of their bankroll.