racefortheironthrone:

If Daeron wasn’t killed by treachery but rather say a stray arrow in battle or, since he probably led from the front, battle wounds either during or after a fight, how would that change things?

It would change his legend a little – glorious death in battle vs. cut down dishonorably. It would, however, change Bloodraven’s reputation quite a lot: while there’s too much stacked against him for him to have a good reputation, he wouldn’t be singled out as a kinslayer until much later. 

Err…on the off-chance that I misread Daemon for Daeron (in my defense, they’re very similar names, both of them were military prodigies who liked to lead from the front, and both died treacherously):

I don’t know if that would change things that much. Anti-Dornish sentiment wouldn’t be quite as fierce, there wouldn’t be a move to execute the highborn captives, for example – but I think it would be rather marginal compared to the central issue of tens of thousands dead in the wars.