I'd actually prefer Minfilia's fate to be sealed and tragic. Imagine how deliciously dark it would be if - after the situation with Estinien - the Scions grew overconfident and believed that they could save Minfilia as well...only for it to go horribly wrong.

It'd also help mitigate the issue of there being a little too many 'close calls' where both major and minor characters are concerned. Death for the sake of death is very cheap and not very desirable but on the other end of the spectrum where death is cheapened by bringing the bulk of characters back from the 'dead' or similarly grisly fates is just as dubious in my eyes.