Orbs will probably get more expensive, because they have a fixed 2500 DEC price. With the upcoming Guild System, with tons of new DEC sinks promised, DEC itself will likely rise in value, pulling up ALL cards bottom prices and making Orbs accordingly more expensive.

The question is, how valuable are the cards from the Winds of Change collection, that we currently get for Orbs?

I do believe that the Winds of Change collection brings a massive value to the gameplay. They have introduced various new abilities and changed the meta we played on the highest level. But will they stay relevant with further cards introduced?

And will we see other orbs before the collection is sold out, that we can purchase in parallel to the first edition, diluting the purchasing power even more and hence increase the cards value?

In regards to Beta cards, they contain some of the best cards in the game, like the five legendary summoners. Their market value is much higher than most other cards. But picking one of the five summoners is not easy, as there are plenty of other legendary cards among the beta collection.

I guess, a healthy mix of Beta and Orbs will bring the greatest joy due to more variety of cards.