I’m assuming Robin’s alleged death will be important and will affect the story, especially Regina’s.
If we hadn’t seen, in the past, deaths that were totally unimportant and did not affect the story of characters, then I’d agree that this is a fair assumption. Death in narrative can absolutely mean something. It can have weight and power and drive storyline for a long time. However, that’s not what we see in OUAT a fair amount of the time. I’m not even just talking about Neal’s death. Many deaths get reflected upon for maybe one episode (and even, maybe only a fraction of that episode) and then the story tends to forget how death impacts people because shiny shiny plot. If Robin is dying (and goodness knows it looks that way now) then I have serious reservations that the show will “make it count” as it were.
Twenty cookies we get a time skip for Season 6 where Regina and Zelena are suddenly best friends, and over Robin’s death, raising Roland and Baby Greenbean together. Emma and Hook will more than likely be engaged, Rumbelle will be stronger than ever, probably raising their new son, and Snowing will be happily raising Snowflake. Then that’s when our Season 6 Villain arrives, throwing a wrench in everyone’s happiness.
"If you go as far as you can see...you will then see enough to go even further." - Finn Balor