Let me start with solution for radiant problem. Radiands could be a reward for prestige missions. For example, you could get one radiant for every 5 prestige points (this is only example). Or make radiant crystal recipe.
Next thing is of course gunner update + new missions.
Then you should make new dlc(s). (You could also make sparks of life drop more often.)
That's it for now. If i'm wrong or if i forgot anything let me know
;)
Seriously now, these "Spiral Knights is dead" threads are getting VERY annoying. People even think that it's dying when it's currently not.
Back on topic. Radiant fire crystals have already had it's drop rate increased before. One radiant for every 5 prestige? As in how much prestige a player has? If so, NO. Players who have more than 10k prestige would be freaking rich in radiant fire crystals. A radiant fire crystal recipe? What would be required to make a radiant fire crystal?
The gunner update and the new missions ARE going to come. Just be patient. I don't know about having a new dlc now.
[EDITED:]