Cheaper is something, but still don't think that the whole system around the retiring the current soulbounds is a good idea. Even with "only" 5x, it will most likely drive new players away when the supply of very helpful cards is so reduced, if possible at all. It's not a bonus card that is really good like Lux, it's a whole set of cards.
I will not be able to complete my soulbound deck before the change, and probably won't be able to afford to buy to complete it. And I'm not a newbie, so I at least have some of them at a decent level.
I liked the idea of having to stake the cards for a long time, and then they unbind automatically. And even if that's not possible - there must be another option.
Also, why do the old cards have to retire? Can't we just have them in a seperate section in the Glint-Shop? One for Chaos rewards, one for rebellion rewards? That way, even new gamers can get the Chaos cards.