As I much as I’d love my gear to cost less, inflation is a real thing, our beloved housing manufacturers aren't immune to it. Overtime, each and every one of them will raise their prices.
Looking ahead: in 20 years time all major currencies will have lost half of their value at least - my guess (through inflation, printing of money by governments, etc) - so I expect camera housings to cost much more, the same way a loaf of bread will cost much more by then.
We can’t expect an aluminium housing for cameras of the future (mirrorless will be a thing of the past, the to-be cameras will pick the subjects for us, and auto-cull our photos while we’re diving… ;)) to still cost around 3500 USD then, unless housing manufacturers have found ways to drastically cut their costs… or underwater imagery has become a mass market, I don’t see either happening.
Take pro camera bodies (Nikon D6 type): roughly speaking they have seen a +50% price increase since the late 2000s: a Nikon D3 costed about 4000 EUR when it came out (can’t remember USD prices), now we’re talking 6000 EUR for that sort of cameras.
Back to Nauticam, we wouldn’t have this thread if they had just increased their prices 5% each year. The other thing which I believe creates some discomfort is to find out about the change the next time you’re randomly (or more intentionally) browsing your favorite UW gear retailer store. It would have made the pill a little easier to swallow if there had been some sort of announcement.
Camera manufacturers have been alerting consumers on a regular basis for upcoming prices increases, a recent example here:
https://www.diyphotography.net/nikon-announces-price-increase-from-next-month-due-to-supply-issues/
It’s nice because you can decide to expedite your purchase to avoid the increase, and if you can’t/won’t, at least you know what you’re up to.
Even nicer if the brand provides some justifications for the change, it saves your customers wondering, and shows a little extra care 
That being said, it’s great to see the other aluminium housing brands able to stay around 3000-3500 USD range for now, and the newcome Marelux to also shoot in that space.