Yeah, your logic is sound.
The future value of 2nd edition cards ultimately depends on whether the game finds a better supply/demand equilibrium for SIM and the meta shifts to make earning income from your city the more profitable route again.
If you believe the game has a future, minting and saving a few of these key cards while they're cheap could be a savvy longer-term play.
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I've got a decent store of 2nd edition cards but I think I'm going to save my remaining SIM for 4th edition!