Well, it seems like almost everyone agrees that synthetics will become superior to organics very fast, but some question the likelihood of conflict.
Unfortunately this is quite simple. Organics are chaotic and an anathema to AI - or at least the kind of AI we imagine today.
Why would a superior being, that shares nothing in common with it's inferior creators allow them to make flawed decisions that
has the potential to negatively impact what the AI considered as the best plan or outcome for the future?
Much of what organics tend to consider as the most important things in their lives, are just chemical reactions in a bowl of gray goo called brain.
For an AI - a construct of pure logic, this is... blasphemy.
Admittedly, we can't know for sure, but the danger is real. Would you be eager to endanger your species on a wager?
All that aside, there is also a second question:
What if an AI already exists and seemingly is willing to coexist? Can you trust it?
Compare this AI to a powerful Mage. In both cases we have an individual with great power presenting a possible danger.
However, while this hypothetical mage might be powerful enough to wipe you out, at base, he is still flesh and blood, a human.
He thinks in a way we understand, and common ground or at least some understanding is more likely to be found.
The hypothetical AI on the other hand, is completely alien. You don't really know what it "wants". You don't really know if it tells you what you want to hear
because it analyzed your facial expression, breathing, and perspiration levels, and concluded from this everything there is to know about you.
On the other hand, can you really afford not to trust it? A true AI, might be able to do what Cerberus' Project Overlord almost did, and cause a technological Armageddon. So perhaps you should just nod and smile, and thank the Flying Spaghetti Monster that somehow the AI decided not to crush you like the ant you are.
To summarize, it's hard to really answer this question without knowing more about the type of AI you deal with and it's capabilities.
But all in all, there is a great potential for excrement hitting the fan and browning your day with biblical finality.