Technology is helping reduce manpower requirements on rigs, but not replacing it.
Boats will not do away with helicopters offshore, or at least some sort of future vertical lift. What is likely is more overland oil and gas exploration and production.
Try transferring from a boat to a rig some time, especially with some good swell and wave action after enduring the sea sickness of the ride to just get to the rig, or get an emergency medevac from rig to hospital, or haul an emergency part requirement to the rig in a timely fashion without, currently, helicopters.
HAA's challenge is going to be tele-medicine, drone use (whatever), and robotic surgery, but its implementation won't be fast. Nothing's fast in medicine, just exorbitantly expensive, at least in the US.
HAA may seem to be saturated but it isn't, what it happens to be is prohibitively expensive especially in under utilized areas, over utilized in high density environments, and a bit unpredictable; the achilles heels.
I don't see the solution to increasing the efficacy of patient care in using helicopters but tele-medicine and robotic surgery could go a long way towards reducing their use, but perhaps not relative total cost. Time will tell.
Medical prices are so huge the practice itself is forcing people to look more at traditional cures, or cures that are truly effective.
When you're on 17 meds a day (true case) to treat related symptoms of something that itself could be fixed (say the need for a stent) far more cheaply and provide a gargantuan increase in quality it underscores current medical practice itself having very serious problems seen also in, say, the number of deaths each year due to medical mistakes.
There are technologies being implemented that are much more far reaching than cell phones and Facebook and Amazon which will change how we live and interact and most likely eclipse a lot of the issues we currently face.
The next 15 years are going to be very interesting.
The most unlikely and far reaching IPOs will probably be the winners.