The G scale "fad" came, peaked, and subsided in the USA.
Manufacturers rode the crest of the wave of popularity, and often overbuilt (numbers produced)... then as the hobby waned, there was too much stock, and prices for new items fell in the toilet.
The manufactures had to liquidate inventory, as evidenced by rock bottom prices from distributors.
When the supply ran out, many people questioned why the manufacturers did not start producing, and the answer is that with the hobby waning, the used market was full of inventory, much of it in pristine condition.
Finally in 2020, Kader (Bachmann) and USA Trains both saw there was again money to be made, even with more tariffs on China.... The story was the head of Bachmann saw used Aristo Dash 9's going for 900 to 1000 dollars.
Guess what? Kader (Bachmann) now making eggliners, the motor block for separate sale, and now the Dash 9.
USA Trains finally came out with their beautiful heavyweight passenger cars, and soon the FEF steamer, and will finally re-do the F3 to a F7...
Seems that Bachmann has somewhat soured on the 1:20.3 market though, probably still smarting from "giving away" Climaxes, C-19, K-27 and Shays. Many could be had new at $200
Greg