From what I understand from Feebay, you are correct that the newer releases command higher prices as some people would pay more to get their hands on the newer releases first. If the mintage is the same and provided not a large amount is hoarded by someone, prices should drop eventually. If you'll notice on Feebay, even BU rolls of newer coins will command a higher premium over the previous year barring a low mintage change. Although, I think there is a curb when it comes to BU rolls of coins. They start off high in price, then drop off in price, and then go high again provided enough time has passed and the supply out there isn't too high. I recall a few months back, I noticed a $25 box of BU 1988 pennies sell for $350 on Feebay. Not sure if many people want to hold a box of pennies for over 30 years to get that profit tho. Hoarding and selling all at once can drop off market prices as well. IMO, if you're going to hoard, it's better to sell in smaller doses to maximize profit. I noticed there's just some astronomical large amount of circulated buffalo nickels being sold off on Feebay right now bringing the prices down a bit. I don't think I've ever seen such a large quantity of buffalo nickels being dumped on the Feebay market like that. Of course, some of these are dealers that need to unload quickly to make profit to meets the demands of their business so they probably don't have much choice but to sell at once.
Kinda like the prices being high for new movie releases on blu-ray in the beginning. The prices drop off as the movie gets older. Some people will pay a premium to get their coins, movies, other collectibles first.
