That entirely depends on how you look at it. Intel tends to keep prices flat. So your $250 CPU will remain roughly that price until the stock is sold out, despite newer versions coming out. Less true these days with the increase in core count, less chips per wafer, more cost passed to the consumer. AMD does reach out to partners for price reductions, but in this case they are already the budget choice. Launch prices of the 3000 series chips and motherboards will likely be a little inflated at first making the 2000 series look good in comparison. Going to be mostly up to the retailers to offer discounts, and that might clear out available inventory and actually increase prices if you aren't quick enough. You might see discounts on undesirable chips (R5-1400 or something), or "deals" on motherboard bundles where they sneak the full price in with the guise of bundling.
In the past, yes new GPU releases could drive GPU prices lower. Lately, they are suffering from GPU size creep and adoption of new technological standards. AMD adopting HBM made their GPUs quite expensive, and adopting early GDDR6 is also expensive, at least for the moment. AMDs latest mid-range GPU release should shake up Nvidia pricing, but until we have independent reviews on the new cards it will be hard to say where they land. Looks pretty good to supplant the RTX2060/1660Ti as good mid-range choices though. Nvidia will still hold top marks in anything faster than the RTX2070.
Still a rumor what Nvidia's next release will be. My suspicion leans toward RTX cards with Ray Tracing disabled, ie GTX versions of the RTX2070, 2080, and possibly 2080Ti.
In this most recent release, the RTX cards represent a significant increase in GPU size in the same lineup from the previous 10 series. Their price is reflected that way. The older mid range 10 series GTX cards were supplanted by new 16 series cards. More or less, every card went down a notch in that regard, but sometimes at a price increase along with increased performance:
GTX1050 -> GTX1650 (price and performance increase)
GTX1060 -> GTX1660 (rough price parity) -> 1660Ti (price and performance increase)
GTX1070 -> RTX2060 (current pricing make it look like a deal, but the 1070 used to be about $330)
GTX1080/GTX1070Ti -> RTX2070 (rough price parity)
GTX1080 Ti -> RTX2080 (A price increase)
RTX2080Ti
Also new old stock of GPUs tend to 'increase' in price as those are the products that were priced too high to sell well in the first place. Those companies like to hold on to the inventory for maximum profit and hope that less informed buyers will pick them up. Some guy sees an old ad, or someone using one in a video, for what a GTX1070 can do will go out and pay $380 for it when they could get a superior RTX2060 for about $320