Sure, but that doesn't mean it needs to happen.
A lot of the folks who like Eureka and dislike the previous relic progression methods have expressed discontent with grinding tomestones for relic upgrades. I remember reading that and thinking that grinding crystals or light wasn't really so different from tomestones... just a separate currency, really. I still think this is true. But it changes the feel of how the relic is progressed for them, and so I think that this tiny adjustment could do a lot to address those concerns. The items could be obtained with various currencies: crystals, tomestones, beast tribe currency, aetherpool grips, centurio seals, etc. Everyone can choose their preferred method of grinding. And while you could just make it all one currency that is rewarded from every form of grinding, it has been shown to have an impact on how people feel about the progression. That was what I wanted to get across.
I dislike the weekly gating in the first place, so this is not a compelling argument to me. I see the necessity for it when it comes to content longevity, but in terms of relic progression steps, I'm not in favor. If someone wants to finish their weekly cap and then continue grinding for progress on their relic, they should be able to. People are going to feel "pressured" into "most efficient" paths regardless of how you structure this relic questline, unless ALL of the steps are tomestone-related (usually there is at least one stage that involves light grinding).
I actually assumed relic progression would be tied to the tomestones that DON'T have a weekly cap. The casual playerbase uses those tomestones for gear upgrades, since they're not getting the Savage pieces of equivalent ilvl. I'm not sure if this is how the ARR and HW relics did it, since I did not do them while they were relevant. I just assumed it'd be poetics, or the upper level uncapped tomes. I'd rather see another Eureka-like grind than using capped tomes for relic progression, honestly.
I think this is a great idea.