Three years is still ample time.. A fourth year of doing very little isn't exactly going to help them, so they may as well push off and make way for someone else.
To have be done little with whoever comes in their place? Sweeping something under the rug wont fix issues this anime suffers from in longer run.
Arguably extra year imo could have made difference in overall impression Iris or Cilan presence would leave on anime and fandom. It would mean extra time to properly bring something to an end giving them better planned and more believable growth without rushing things up. Explore more on their rivalries with Langley and Burgundy which are now irretriveable gone, do more with their teams and have their fans chance to enjoy in their presence and entertainment they bring to show.
And Brock is proof that just because you keep a character an insanely long time doesn't mean they get any better.
Im not sure how Brock alone proves anything? Thats same like saying how treatment of Gary in OS prove alone in what way Ash future rivals would be treated. Which was anything but case with Paul and Trip.
How treatment of Ash Johto team will convey itself to any future gteam Ash acquires.
Or how treatment of first male replacement Tracey indicates in what way any new future male is going to be handled.
See where this goes?
Each character has different personality and role he/she performs. Therefore we don't really know in what way someone else would be treated in case longer stays is on repertoire.
Speaking of Brock i don't necessarily think his long stay was bad either. We learned more about character, see him collect all kind of new fantastic pokemon, work on his breeder skills and give us many memorable moments with humor and flauntig dynamic he brought. I still stand by what i said how his best moments came from Kanto and Hoenn followed by Johto.
I disagree honestly. I don't think the people that got tired of characters like Ash, TR, Misty, Brock, etc. can all be accused of this because they have short attention spans or don't appreciate long-term character arcs and you can't generalize people like that. People that didn't like the way Ash, TR, Brock and Misty over the years and preferred characters not to overstay their welcome have some very valid reasons IMO. The problem is that they either become repetitive (TR), inconsistency with characters (TR and Ash), character being too much pushed into the background at a certain point (Misty and Brock), becoming unbearable to watch (TR). There's a lot more to it.
Perhaps i should reinstate what i said, because i didn't wanted to give out impression how this was the only reason. But i can't deny how good number of those fans get quickly tired from any character writers introduce in this show. I met several times mindset of people being bored of character after just few months wanting them replaced. For example Iris was one year less in show than May or Dawn,or two compared to Misty barely reaching 3 years yet there were people which got sick of her just after first 6 months she joined cast. Showing how its not so much long stay, but more way writers treat someone in what way he will be received. Or character not being what some expected or wished them to be. Because some can be acquired taste requiring time to have them grow on you.
Naturally they don't speak in everyone name because there are people whose detest toward certain characters came either from disliking way they developed not changing in way they wanted them to be, because they grown fed up with following their personalities and dreams or because few negative experiences as whole outweight anything positive about someone starting to dislike character,. Regardless if writers fixed things up restoring their appeal or didn't.
Which applies to everyone, whether its original crew and antagonists or newer protagonists too like May, Dawn, Iris etc.
I just wanted to say how longer character stays and as more of fans come into the show getting familiarized with them their popularity and supporters but also amount of complaints will continue to increase because of simply staying for long enough to build higher base of likers and dislikers. Which plays factor into why bigger number of complaints can be found in Ash, rather than May case too.
I wasn't trying to imply how group of people represent general view from fans in general or how those which complain can be simplified in only two groups. So apologies if my post have caused misinterpretation.