Yes it's a double edged sword. It is not great to see something you bought for so much drop in value.. and then the utility of them is also limited for 2 years before a new set comes in.

It is a similar story with the Gods Unchained genesis cards, how do you keep the game going without removing the meta from them?
Splinterlands can give older cards utility again, it's just a case of how long it takes for them to figure this out..