New here. Do core elites go into sets eventually? What keeps there prices from tanking when better cards get released?
Yes. They will be eventually be eligible to be used in exchange sets for players of a higher OVR once both sets and players - typically 90+ OVR - are released into the game.
As for pricing, tanking prevention can be for a variety of reasons. Others will add their thoughts, but scarcity is one key reason, esp if it is a high end Core Elite item player that doesn't receive any further upgrades.
The upcoming Team Diamonds promo is another reason why prices will also stay high for certain Core Elites, and will most likely rise too in response to increased demand.
Training value for a while then they will make a set that requires them to revalue the cards. In the past the cards were also needed in power ups but since that is gone (outside of Legends and maybe special programs) they will probably not hold their value well once a newer version of the elite is released.