Jebel Krong wrote...
as much as anyone hates to see their favourite character/LI die, thane's mortality was explicit right from the start - to cheapen his character with a "cure" would just be a cop-out and cheapen an excellent character - better to die with dignity. i fully expect certain other characters not to return: mordin (age), jack (no reason to stay other than shep romance), grunt, samara (no reason to stay) etc despite popularity/merit of any.
So, curing Thane is a fanservice? Yes, but I don't think fanservice is always a bad thing. To a point, Bw still listens to fan feedback, and incorporates things in the games that the fans asked for or would love (Kasumi's dress for FemShep, ammo/thermal clip system, regenerative health, etc).
Curing Thane would certainly not cheapen his character, if you read my post above, you'll see my reasoning. No one gives a reason for why it owuld be 'cliche' or why it would cheapen Thane's character. Did making Tali romancable because the fans wanted her to be so much cheapen her character? Not to them, no. Did changing the combat system cheapen the experience of the game? No.