Leliana,AListair and Morrigan had enough content already for my tastes,Morrigan isn't bearable for players like me one full game (DAO) one Dlc dedicated to her research and another full game DAI was more than enough to me,another game with her will just inacidate my opinion of her even more, same for everyone else.
Cullen and Alistair aren't more showed than Morrigan since the former in DAO had a very minor role and in DAII he had a little side role while the latter had an importat part in DAO but a small part in DAII and a small part in DAI cmpared ot MOrrigan (Gw alistair included) and i'm already tired of them as well.
I agree i would love to Leliana , Alistair and Morrigan and well pretty much old characters to not appear anymore well with exception of Solas for obvious reasons. I said Morrigan is bearable because she is far from most characters that appear she pretty much appeared only in 2 games and 1 dlc compared to Alistair that not only appeared in 3 games but also in EU and well there was quite large break between her appearances.
creating a good/great character like Leliana or Morrigan isn't easy.
making that character to be loved by a lot of players isn't easy too. You need to be a good writer, and in addition you need to be lucky. To found the "right alchemy".
Why sholud bioware throw away one of those great characters only because the 2% of the player deliberately and optionally decided to create the conditions of their death?
Great characters heh, Leliana is pure mary sue unless you are talking about dao Leliana where she wasn't bad but pretty average character. That speaks about bioware writing skills if they can't write decent character and need recycle same character over and over again. Honestly i doubt that was reason , writers favoritism toward her is so obvious at this point that it is pretty much clear that devs shove her in most of products becuase she is writers pet.
Also , how do you know only 2 % killed Leliana and then killing her is hardly deliberately unless player is metagaming. If they gave player option and then allowed import their world state yes they should not involve character that have absolutely 0 reasons to reappear