It'll be interesting to see Nintendo revisit this in a year. By then they'll have data on exactly how many people took the Expansion Pak upgrade and, IF people vote with their wallets against this product offering, Nintendo will be strongly pressured to either improve the value proposition (adding more systems, games, or features to the expansion pak) or lower the price.
I think Nintendo DOES want to hit a $50-60 annual price for this to bulk up on recurring subscription income (the best kind of income! yummy!), so I think if it came to that they'd be compelled to try to sweeten the pot instead of lowering the price: add the GB and GBA systems, flesh out the game libraries of existing systems as much as they can, throw in MULTIPLE free DLC packs (imagine, for example, if there was a Smash Fighter's Pass Volume 3 and that was promised! Or a Mario Kart 9 DLC?), or come up with some other additive features, like Pokemon Box, Mobile Game bonuses, Better Gold Points Cashback Bonuses, etc.