Why release in 2019 when the hardware they need to put in the box would cost more than it would if they released in 2020? Especially when yu consider that they are still about to have another over 17M selling year. So PS1 and 2 released after 6 years. PS3 and 4 after 7yrs. Sounds balanced to me.

The switch does 15M and is considered a success and sony's 5yr old outgoing console does 17M+ and its "losing"? And this isn't even about anyone being invincible. Your exact words were that you "you still think they (PS5) will lose to switch." And you got all that from sony messing up in 2006? If this is you being sure about something I would hate to see you when you have your doubts. 

Releasing a discless console is just a dumb idea, how much do a blu-ray drive cost sony/microsoft? 10$ is my guess. Same with releasing a only streaming box, it's a waste of time, so far this is just rumors so I would w8 if microsoft will really do something like this.

1 idea I have is also releasing a ps5+ or next xbox+, these consoles would have vapor chamber cooling and twice the hard drive storage space, but still exactly the same cpu/gpu performance. I like this idea as some people probably want a really quiet console or more storage.

I agree with you that releasing a 399$ console in 2019 would be the best business strategy, according to two insiders at resetera (benji and Matt) this was Sonys plan, but looks like no longer. For what reason we don't know. Anyway we will probably get a more powerful console in 2020 for this reason :)

1)  PS4 released after 7 years, because the PS3 was so ambitious.  It released at a $500/$600 price tag in NA.  PS3 finally got a version at $400 in Nov. 2007.  This is 6 years before the PS4 released at $400.  Sony really is consistent at releasing every six years, assuming it releases at a comparable price.

2)  The success of the PS4 does not help the PS5 succeed at all.  Just like the best selling console, the PS2, did not help the PS3 succeed at all.

Quieter and more storage has never been a driving factor for sales. Ever.

A disc drive cost them $20-$25. 

Say a $399 console with a 1TB SSD and a disc drive is sold at a loss of $10. Taking out the disc drive will mean they aren't losing that $10 and instead making around $10-$15 profit on each box sold. Then adding the discdrive and doubling the SSD size and selling that for $499 puts them in a position where they make around $50 profit on each box.

The disc driveless box also pushes a mojority of buyers into the digital store where sony'gs margins are much higher on everything sold. 

Yup true...... doing it at launch will be too big a risk. 

I would guess that it would be cheaper for them to just make the console larger and use a better copper core heatsink with a bigger fan like Pro at $399 (XB1X $499). The fan should really be much larger in circumference like PS3 though, for lower rpms leading to quieter operation assuming reasonable quality, which would mean a deeper, wider, slim case. They could also design it so the PSU isn't behind the heatsink dealing with the APU heat, but separately beside it, so the APU and PSU would have their own smaller fans.

PS was probably quite happy to get out of the PS3 era, much like how MS probably can't wait to get move well passed the XB1 era. MS no doubt didn't mind having 360 on the market for 8 years, just like PS probably wouldn't mind if they could get away with PS4 for 8 years. 360 and PS3 were designed for a solid 10 year lifespan though, and that's pretty clear based on the hardware, besides the cooling early on. PS4 should be getting replaced in 2019, based on the past, but there was a little backlash about PS4 not hitting 1080p consistently early on, and we've seen that a little with Pro and XB1X at sub 4k. If PS5 can't do full 4k at the right price in 2019, then maybe PS wants to make sure they deliver on that this time around and so wait until 2020. Not to mention Pro. Would XB1X in 2017, and a PS5 in 2018 or 2019, have really been big trouble for PS? If PS4 could have lasted 5 or 6 years, then how long can Pro last passed 2016? PS isn't exactly forcing people to stick with PS4, assuming you've already bought one, because Pro has only been another $100 if you want something better.

PS4 success does not guarantee the success of PS5, but it does help, if PS5 remains x86 and is affordable. PS1 was a great console with new media tech and a reasonable price, with some competition. PS2 was mostly BC at launch, with new media tech, and for a reasonable price, with little competition. PS3 was BC at launch, with new media tech, but was way too expensive and had really tough competition. PS4 wasn't BC, used existing media tech, was an affordable price, had some competition, and a mid gen upgrade. The one thing that stands out about those 4 systems, is that PS1, PS2, and PS4, had a worthy overall games line up, where as PS3 suffered greatly. If PS5 remains on PS4's path, and just takes bigger steps, like offering some 'native' level of BC, and maybe 4k media tech, it'll do just fine. The biggest threat to PS5 will either be their ego, or the competition. Maybe both.

Hasn't MS basically confirmed that they will have multiple options from here on out?

They haven't confirmed anything. There are rumors though. Like a stream box (which honestly any $50 android box, phone or tablet can do), a mid level sku ($399 1080p/60fps) and a high level sku($499+ 4k/60fps). I actually like the idea of the lower and higher level sku out of the gate, but yh; still just a rumor.

I voted for the one without the drive and just 1tb but not because I want to pay less but because I don't want a disc drive and I would upgrade the had anyway to a ssd so that just makes more sense for me even though the console would cost me more because of the ssd and the digital versions being more expensive most of the times...

Edit: fix the damn auto correct.

My opinion on the all Disc Drive and full digital consoles is that MS/Sony will have to be willing to take an up front loss on the hardware to pursue the long game of more profits from digital sales, Subscription services and fewer used copies been resold, I don't think simply offering a console without a disc drive for $50 would be worth it or be very effective. They would have to do something along the lines of:
$499 - Console with Disc Drive
$349 - Disc-less full digital console

I think at the start of next gen if either or both MS and Sony go this route the disc drive will be the top Sku initially with the digital only console eventually becoming the lead Sku 3 years into the cycle as the digital trend speeds up.