Nah.
People who need the radiant shards/energies (for raid gear) raid CE. People who need ascendent mats (for vendor gear) don't need CE raid mats...so the daily makes sense. If you had friends that played Destiny but didn't raid (like I do) you would understand why ascendant mats are still important.
Also, keep in mind we have A LOT of fellow players that did not pay for the expansion, so getting radiant materials is 100% useless to them since they don't need to get past level 30.
Now, if you wanted to make radiant mats the reward for dailies for missions from TDB expansion, I would be ok with that.
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I know that Ascendant mats are still important - just not for me really. Hell, I want them to still be in the loot table, but my thinking is just to add Radiant mats in. I get your point concerning players owning TDB, and a simple fix for that would be to make it so that you can only acquire the Radiant mats as a reward if you have the expansion - or just like you said, make them the reward for daily TDB missions.