Mat Piscatella "Npd Sales Insider" says...
"PlayStation 4 hardware unit sales achieved an all-time October high for the platform, while PlayStation 4 hardware dollar sales reached its highest point for an October month since October 2014. October 2018 unit sales of PlayStation 4 reached the highest mark for any PlayStation hardware platform in an October month since the PlayStation 2 in October 2002."
That's mighty impressive.....Why would Sony dare to bring in new hardware in 2019? That would be such a self-defeating move....At this point, nothing touches PS4 and demand is through the roof, so keep fueling and distributing PS4's and great games and let that Ryzen 7nm++ and Navi mature for late 2020......Then we rinse and repeat....
You don't wait until your current product has lost all interest and sales have dried up to announce a follow up. That tarnishes the brand.
There's a sweet spot in the product's life cycle where the interest is strong in the brand, while you have made most of the products sales and technology has matured enough where a successor product is possible.
You also have to be wary of the competition, given the fabrication nodes available now, if Sony doesn't have a machine to answer to MS's new offering, it could represent a big blow to the business.
For some reason some fans think a year or two make a huge difference in terms of power. They don't, new fabrication processes do. A Ps5 on a 7 mm process coming one year later than an Xbox whatever on a 7 nm process will not be much stronger.