No, seriously. The current token system is dysfunctional and is probably best replaced one way or another. Replacing it with the saga system actually makes a lot of sense. (They just have to fix the numbers from what are ultimately first-pass numbers on a test server, and it would help if they added more epic Eberron sagas.)
I'm new to DDO within the past 6 months. That's important in this case in that it gave me the benefit of going through my first TR with a fresh set of eyes. My experience went something like this:
(1) Wait, only a few certain older content chains drop tokens? What about all this new content that I bought and I'd like to play? If I play the new content, I'll make no progress towards TRing.
(2) EE is way too hard for my first life character with no epic destinies completed. Meanwhile, EN and EH quests mostly drop like half a token per quest except Devil Assault and Cannith Challenges. Grinding this will take forever unless I play DA or challenges only.
(3) I can farm a token in 2-3 hours on Time is Money. It gets quickly boring, but if I want to TR, why would I ever play anything else?
The token system heavily incentivizes you to run and only run a narrow sliver of two arbitrary P2P content packs. This is terrible game design.
Presumably, the reason you need to farm hearts at all is so that players are required to take their freshly (re)minted level 20 characters and at least dabble in epic content. The token system, as it currently stands, does pretty much the opposite - it makes people tediously farm just a couple of specific quests and ignore epic content generally.
In theory, you could fix this either by overhauling tokens by making them drop in all epic content and nerfing the DA and Cannith drop rates, but balancing drop rates to avoid making something else just take DA and Cannith's place would be a nightmare. Using sagas instead effectively eliminates this as a problem altogether; people have to dabble in a variety of quests to complete the saga. Also, it's easier to balance drop rates on just a handful of sagas than every single epic quest individually.
TL;DR: The token system is broken, Turbine just has to fix the numbers for saga drop rates and it's a substantial improvement over the status quo.