On a side note, I think that the t4 tokens should be only offered in the weekly purple box, with shards being a chance in both purple and blue boxes as they already are.
You can buy yourself a set of full t3 gear on the item store and many consider t3 largely outdated these days so I see no point in removing t3 tokens. Not to mention you can trade your t2 and lower tokens into t3.
Additionally, seeing shards added in small batches to all tiers of raids as well as unchained/godslayer mode dungeons would create some popping of content that doesnt get ran much cough Ai District cough
This way, casual PvErs who wish to farm RF can still farm it, as well as PvPers who would rather get their 1 raid out of the way and go back to their PvP. People who want to do PvE outside of RF have an alt option to earn shards for rings, and people who want to learn instances have a chance to see/learn while having a carrot dangled in front of them.
But part of why RF was created was because of the growing number of Casual PvErs. People who were in guilds that struggled to do t1 and t2 raids. People who were in social/casual guilds who couldnt raid at all.
In a scenario where shards are added to actual raids and such, with RF being kept for THOSE people, seems to be a win win.