As long as the new controllers have more input options rather than less, it won't be a problem. Same with tracking. The old games might still limit your play space unnecessarily, however tracking should be 360 degree and in a bigger area I would think. Prompts like show the light bar and calibration need to be patched though. I doubt psvr 2 will still use a camera for tracking. Using PSVR  1 on PS5 is a bigger challenge to support the old tracking next to the new for a couple years.

Prob heavily frontloaded hypebuying this gens VR had so i do not think it will do much more.

The bundle with Doom and the camera, but no move controllers, has been on sale a number of times in the US for $199.  I tried to buy it last year, but that bundle was sold out everywhere. Other bundles were not nearly as attractively priced.

Sony announced 1mil sold at the start of June 2017, 2mil at the start of december 2017 and 3 mil in mid august 2018

as PSVR launched in mid oct 2016 it took ~8month to sell 1m, ~7month to sell the 2nd mil and ~8month to sell the 3rd announced million, so selling pattern up to now doesn't look all that frontloaded

Hmm indeed, im curious to see how VR will evolve if this stays an ongoing trend .

I voted 4 million.

I think the next PSVR version will be the one to buy; the current version is lacking in every aspect. It's basically a beta version, and the next one will probably benefit from AMD's navy multi-core GPU technology through "infinity fabric." Once that one get's announced with the PS5, it will probably consume any future sales of current version.

So when do you expect the PS5 with these enhancements to be available? A PSVR2 which is building on these features won't be launching earlier, probably even later (otherwise it will be an expensive holiday for early adopters, who want the complete package of home console + VR headset at the same time)

5M possible, maybe even 6M, but for more Sony should make a far bigger marketing effort and get more 1st and 3rd party VR games, and as the market showed that even growing VR is still niche this gen, it's most likely that Sony will allocate such larger resources for next gen. The good news is that once there is the right HW, the biggest effort is only finding a good input paradigm for free roaming (VR on rails makes little sense except for a few very simple games), while with enough GPU power the graphics part can be dealt with almost automatically, it's just matter of calculating each two frames from two different points of view (corresponding to the eyes) of the same scene, so it even takes less than twice as much computing power as with single frame 3D projection, as the initial steps for each doble framecan be shared, and the HW must anyway manage a single world viewed from two points of view, not two worlds, this means that VR requires a very reasonable increase of computing power and almost no increase in dev resources and time for graphics. Once HW and input matters are solved and HW is affordable, VR becomes viable and the only step remaining is making more people like it.

I think it will reach 6 million. That is because I believe PSVR2 will not release alongside PS5 (2020 is my prediction), but a year later. I don't think Sony will want to overwhelm the consumers with multiple (relatively) expensive products. They will want people to be able to afford PS5 (and some games) and a year later when "the bank account has money again" to spend that money on PSVR2. Also this will give more R&D time for PSVR2 and more time for first party games for it. The horsepower of PS5 will be able to push PSVR1's specifications to the max and play its games "the way they were meant to be played", so owners of it will also see improvements to their current library.

I dont think so, while software sales are definately good, HW sales arent.

If the current PSVR is supported by PS5 it will, but if the current is exclusive to PS4.. I cant see it happening.