Very very possible, as others have said it should even be higher. I do suspect sony is limiting the amount of consoles its shipping out though. Forwhatever reason. probably trying to avoid what happened before. Or maybe they are clearing the channels for  revised SKU.

Anyone that is aware of what sony has done all of this gen would have seen that 16M previous forcast for exactly what it was. Sony always seems to undersell their expectations maybe just only so they can come back and outperform them. Or they are opting to err on the side of caution. Either way there was no way they would only ship 16M consoles. 

Just watch as the shipment total increases every other quater until the end of the FY.

Unfortunately seeing things like this makes me feel there is very little chance of us seeing a price cut this year. Like as is there is absolutely no business sense in dropping the price. That literally would be like leaving free money on th table. They are already shipping more than twice the number of their biggest rival, and 3 times the nimber of their direct rival. 

Selling on par this year with what they managed last year. Are well on track to hit 90M sales this year. Which would mean they had another at least 17M console year.

Outside a holiday prmotion, why would they drop the price? Charity?

First year of Switch a lot were betting Switch would outsell PS4 and aligned it would keep outselling all the time.

That's not low.  That's actually about normal.  The only time it's really higher is during the holidays.  Sony doesn't always give us sellthrough to go with shipped, but sometimes they are close enough that we can guess a few things.

On March 1st of 2015, they announced they had sold through 20.2M units.  They shipped 22.3M as of March 31st for the same year.  Even if they had only sold 500K for March, which I kinda doubt that was the case, they would have had 1.6M on shelves.  It was most likely closer to 1M.  The gap between shipped and sold for the end of 2015 was also only ~1.8M.

Last year, the gaps seemed a little higher.  VGC estimated it at ~1.98M for this same point in time.  Of course, it was PS4's best year, so it's understandable that you would need more stock on shelves.  This year sales are a little lower than last year's, so it stands to reason you wouldn't need as much stock on shelves to get you through the same amount of time.

Oh!, I'm sure Switch is going to sell a lot in its 3 first years...even surpassing PS4 sales. But to reach 100m sales lifetime, this requires a level of consistency beyond the third or fourth year of the console that no Nintendo home console has ever had before. Nintendo is the best developer in the world and their games some of the best selling ones, but their consoles are designed to serve as the best way of selling their own software. People buy the most famous Nintendo games and play them through the life of the console and for diverse reasons don't play other famous 3rd party games in those consoles. Nintendo basically can't compete with the library of PS consoles and that's why each PS home console has sold more than 80m. Despite some success with very good indie games, Switch is still lacking the biggest 3rd party games and when the next PS or Xbox reveals, Switch will become even more obsolete for 3rd parties than now. When PS5/XBox Two launch in 2019/2020 i'm pretty sure it will affect Switch and will slow the sales of the console. Despite all of this I expect Switch to sell around 70m-80m lifetime, a very good number of sales for a home console in my opinion.

Sohold off until all the megatonslike  rdr2, spiderman and tlou2 are out then cut it by 100 with a new super slim 7nm model in 2019?e

Well, PS+ have been higher every Q. Sure it could be 3 months on Holiday, but still is the first drop. But I think on Q4 we shall be over 40M PS+

Could also be some disappointed PS3 and Vita gamers who canceled their subscriptions after this announcement: https://blog.us.playstation.com/2018/02/28/ps-plus-games-for-march-additional-service-changes/

Probably only a temporary dip until they get over the disappointment and finally make the switch to PS4.

Does someone know where I can quickly find the missing Q results for the PS4 ?
Here I could not find :

http://vgsales.wikia.com/wiki/Video_Game_Sales_Wiki