I don’t think that’s particularly likely. Eliminating Adrenaline as a mechanic would require a decent amount of restructuring through the Warrior’s trait lines, and most of what’s in place in that regard isn’t easily transferable to weapon-swapping mechanics.
Additionally, this isn’t particularly necessary. The warrior already has the ability to use the highest number of weapon combinations, and already has a trait which enhances weapon swap, making this hands-down the fastest class to swap weapons in combat.
In contrast, the two classes that have fairly easy access to more than two skill-sets in combat (elementalist and engineer) have that ability mitigated in some way. Elementalists have a small number of possible weapon combinations (5 compared to the warrior’s 19), cannot swap weapons in combat, and takes longer to swap between attunements than other classes to to swap between weapons. Engineers also cannot swap weapons in combat, have a mere 3 possible weapons sets, and in order to have access to skill-swapping in combat must use a utility skill slot to do so.
TL;DR: This would pretty much wreck the warrior’s internal skill/trait balance, necessitating a near-total rework of the class, and wreck the balance of warriors against other classes.
EDIT: Another factor that I didn’t initially consider are weapon sigils. Some of these apply a quite long duration boon when you switch to the weapon in combat. Giving four weapons to a character would allow you to get some ridiculous boon chains going if you had a different sigil in every other weapon, or each weapon.
