Which would hardly serve much of any further purpose than that, now would it. Or any at all, given that Wardens already proved their worth within DA:O itself, through just such a sacrifice of our, the player's, choice too if we so wished.
Warden PCs already are quite intensely remembered either way, and will continue to be for as long as DA:O's story-line will be mentioned in the further games, and "passing mentions", which the developers hinted at would be part of DA:I anyhow certainly do not require their physical presence.
You compared this with ME3's "ending drama" at one point. I'd argue that that is not valid at all: one of the things pointed out about ME3's contrived end is that it literally came out of nowhere. In DA's case, we have known since DA:O what is in the cards for the Warden-PC. And if you like to imagine your Warden PCs going down amid a heap of baddies? I don't see how sending them off through the "Calling" would not leave sufficient room for this.
It's just wrong. DAO and the Warden introduced us to the Thedas, they deserve respect like them or not. Just like those old arcade games I personally never played but I still respect them and their creators. They were the beginning, they were the past. Without past there wouldn't be today, there won't be tomorrow
No, they are not. We hardly hear anything about them. Even in DA2 there was very little.
Physical presence would be epic. It'd be like... 5-min version of Avengers. Short, but awesome
No, Calling doesn't kill the Warden anyway. And if Alistair is fine, then Warden should be as well. There is no reason beyond "Let's-just-get-rid-of-them-already-who-cares?". And we were given whole two characters who may be able to postpone the outcome, to get rid of the negative effects: Avernus and Architect. The epilogues also mentioned that though DA:O/DA:A is over, the Warden's story isn't
Again, killing off such important characters off-screen in some lame darkspawn mob fight is just terrible and that's it