Since Nvidia's launch of it's first Riva GPU in 1998, it has launched a new GPU every year. But during bitcoin mining boom Nvidia was raking in so much cash that they didn't feel compelled to launch new product and skipped a year for the first time in 2017 and have been milking the 10 series for 4 years alongside RTX 20 series launch in 2018 then skipping another year in 2019. It's only the poor performance in gaming division during call to investors at current fiscal year that Nvidia accepted that low adoption of 20 series was to blame.
Nvidia is in competition with it self pretty much because even in launch video Jensen confessed that PC gamers with 10 series did not feel the need to upgrade to 20 series that is why they had to make the pricing and performance compelling for upgrade.
My two cents in this are: it's not the hardware launch that drive the PC hardware sales, it's always the software that forces people to upgrade. 20 series launched and 10 series owners didn't feel compelled to upgrade coz all the games were running fine with 10 series and I think it will be the same response with 30 series. All the current games run fine on 10&20 series and except that a hit new game comes out (like Cyberpunk 2077 etc) that compels for an upgrade, right now there's no urge to upgrade.
Major hardware sales have previously been driven by Windows launches, remember the days when Microsoft used to launch Windows every few years and you used to immediately find out that your PC was struggling on new Windows, specially the move to Vista & Windows 8. Regardless of how badly optimised it was, it still drove PC sales nonetheless.
Same with Game launches, every major game launch drives hardware sales specially GPU sales. Look at the recent launch of Microsoft Flight Simulator, (which is essentially the "Can it run Crysis" game of today") it is estimated to spur a staggering $2.6 Billion dollars of PC hardware sales including accessories like flight sticks, throttles, rudder pedals, and even simulation seats, frames, and VR gear as predicted by Wall Street investment firm Jon Peddie Research (JPR).
Now, there are people who upgrade just for value, that selling their 10 series now would preserve from depreciation, but you will have to add much more to that cash to get new 30 series, specially with local prices of new high-end hardware, and that new card will depreciate in time as well, so you are not actually saving anything, it's just what we tell ourselves to convince ourselves to upgrade.
I plan to upgrade to 3080 coz of work but will wait for more specs on HDMI 2.1 (VRR, ALLM, QTF & QMS etc), overall reviews and prices to drop a bit in xmas holiday season maybe.