Cant say i did considering how i expected this to happen from beginning.Dawn was good character having nicely fleshed out storyline as coordinator getting a lot more development than any other character except Ah received and while im sure her arc could have continued for another region like Mays did in BF if writers wanted to keep her,departure was sadly inevitable.
Formula of pokemon series is to replace Ash traveling companions(in general) after one region is over because of advertising purposes and writers desire to add new female fanservice in girl case.Personally i dont approve this approach but as past showed writers dont seem to plan on changing this anytime soon.
Why do you want Iris to take a hike? The BW trio has excellent chemistry.
Maybe because he doesnt like her?
Personally i agree on notion how BW trip has pretty good chemistry so far but in my opinion interactions between original trio were even better providing that colorful dynamic which cant be found now days.
She's my favorite pokemon character but since it was expected I wasn't saddened by it. As much as I love her I prefer it this way. Better to go out on top than become stale and useless like... ... not going to say it.
Would she?
To be honest as long writers would have done good job with Dawn continuing to develop her story as coordinator properly there is no reason to believe how her character would all of a sudden degrade.If Dawn was kept past Sinnoh story arc of being coordinator would have probably been refreshed with new rivals and challenges being introduced allowing for further growth.
Judging by chemistry between Ash and new traveling companions in Unova shows how writers know how to do their job right.
In nutshell it doesnt matter how long someone will stay in this show as long writers are doing good job with it.
Granted there will always be involved mix of opinions from people with some finding certain characters becoming stale in this show while others still enjoying in them but thats matter of opinion than anything else being impossible to please everyone.What matters is quality and as long people are content with characters role in some show there is no need to change anything about it.
Having character stay is more of blessing compared to their leaving ending up halfway developed,eventually forgotten and relegated to status of minor characters despite having potential to offer more.
That is one of main reasons why departures from May and especially Misty were viewed as mistakes among fandom.