At the risk of beating
@Bigbella 's horse....
Honestly they will likely never do that and probably don't care. I don't think Apple gives a second thought to whether I switch from my Perdix or you switch from whatever you use.
The market they are going after with this small hardware upgrade to their platform isn't us, it's the person who dives a week or two every year or two. Right now that person has two choices: rent a computer for $50-100 a week or buy a basic nitrox computer for $300 or so (everyone stopped selling air-only computers, right?). Either way, they end up with the same thing. A puck of some sort with hard to read B&W LCDs and an interface they have very little idea of how to read except that if it starts beeping they should probably look at it and try to find out what they are doing wrong.
Now they have a third option. A more expensive version of a device they likely have already since they are an active person for whom diving is just one of many activities they partake in. And then a $10 charge for their vacation to enable a really nice looking, full color dive computer which tells them in clear instructions what's going on and what to do. And it's a device they already know the interface for.
That's before you consider all the possible synergies of a dive computer with GPS, WiFi, cellular, microphones, speakers, vibrations alerts, frictionless connection to a phone, web browsers, etc.
From my recent observations on boats, something like 10% of people are diving with a Perdix like device, maybe 20% are using air integration. But then account for the fact that, like in most activities, 90% of the activity is being done by 10% of people and you realize that those of us who own these $1000+ dive computers are a tiny sliver of the population. Those who need all its capabilities are even smaller (I have one because I want the AI; I immediately switched it into Rec mode and even there I need a fraction of its features).
Fact is Apple is going to sell a ton of these devices whether or not Oceanic sells a single copy of their software for it. As someone way back pointed out, the real potential innovation here (besides the world's second biggest company offering a dive computer) is the separation of the hardware and software.