It does seem like the "pro-level" flagship model cropped sensor cameras has $2,000 release price. It started two years ago with the Canon 7D Mkii with a release price of $1,800. Then early last year the Nikon D500 at $2,000. Then late last year the Olympus E-M1 Mkii at $2,000. Now the Panasonic GH5 at $2,000. At least with Canon and Nikon we have high-end enthusiast models that are lower price. These enthousiast models have most of what the "pro-level" cameras have but a price around $1,500. Canon has the 80D and Nikon has the D7200. Hopefully Olympus will come out with such an enthusiast model, or the E-M5 Mkiii up-specced to this level. I am sure Panasonic will have a GX9 in the works.
Aren't they already there? Doesn't the E-M5 II have a lot of what the E-M1 has? Doesn't the G85 have most of what the Gh5 has? Both of those models cost less than half of their $1999 brothers.
I think it depends on how we as consumers look at things--we really should look at usage & value add rather than features. Many photographers don't need some of the 'pro-level' features, which can ironically be detrimental to image quality or getting the shot. Pro-level bodies are typically very good for extreme purposes.
For example, Nikon has a few 'pro-level' bodies (w/launch pricing):
- D5 (Full Frame) $6,500
- D810 (Full Frame) $3,300
- D500 (APS-C) $2,000
And then the 'enthusiast' bodies:
- D750 (Full Frame) $2,300
- D610 (Full Frame) $2,000
- D7200 (APS-C) $1,200
Each has a purpose--and the pro's are specialized. The D5 & D500 are all about autofocus & buffer: speed & getting the shot. They sacrifice low level dynamic range for high speed / ISO performance. In fact, the D5 has the lowest performance at low ISO's of all of those cameras listed--worse than the D7200.

On the flip side, the D810 is for high image quality at the expense of speed. It's slow--slower burst than the D7200. D810 for portraits & landscapes; D5 & D500 for sports & wildlife.
The enthusiast bodies are blend--not as extreme. eg. D750 is faster than the D810 and has higher image quality than the D5 up until about ISO 1250. The D7200 has similar IQ as the D500 but is slower. Most pro's need extremes and have multiple bodies.
When you look at pricing, it becomes very interesting. These categories start bleeding into one another. For example: A D750 has better IQ than a D500, but the D500 is quicker. So maybe instead of a D5 (speed) + D810 (IQ) for $10k, you go for a D500 (speed) + D750 (IQ) for $4k. That's significant. If you're after only 1 body and don't primarily shoot action, the enthusiast D750 outperforms the pro D500 for a similar price.
There have analogies in the m43 world as well; but m43 will obviously compete with the above as well while bringing additional variables (eg. size & cost). And each obviously also competes with current street & used pricing as well.
But overall, if we purchase based on use & budget rather than overall features, there's only so much manufacturers can retail at before consumers look at different options.
With some cameras, we're already close to some practical physical limits with IQ (eg. with diffraction, noise performance, resolution, etc.), so the only practical way to drastically improve is not up in IQ--it's sideways with more or improved features. This means faster bursts, better AF, etc. If they're not relevant features, they're not worth it--and these are 'pro' features. So we could very well see pro bodies go up; but hopefully consumer bodies will stay around the same.
It's pretty cutthroat, with diminishing returns quickly setting in.