Let me see:
Things im satisfied with in these show:
-writers gaving more focus toward groups pokemon,giving them nice development,different personas,receiving proper amount of screentime(not everyone of course,but compared to older days its a big step forward).
-Characters being more focused on and their stories passing through nice route of development.
-Ash getting actual rivals introducing Paul who is treated properly,unlike it was case before.
-villains getting fair treatment especially now in Sinnoh with introducemnt of Hunter J and Team Galactic,giving them decent ending.
-Sinnoh having less fillers and more arcs,more than in older regions.
Things im not satisfied:
-Mistys treatment in this show in these days being reduced to extremely small and rare appearances,which is truly a shame because she is interesting and unique character.She played important part toward raising this show along with Ash and Brock toward popularity status it reached back than and now,just to be ditched with no closure(returning to gym out of obligation in last minute doesnt fall under category of getting proper ending) being ignored almost completely nowdays.
-anime sticking too much with games.I remember back than when writers were going more off route giving us more anime made arcs,whole region which wasnt from games adding to this show more unpredictabillity not knowing what to expect.
-constant girl replacing with every new region leaving older characters forgotten,like they were never part of this show with each pasing saga making them less and less relevant.
-some random releases like Ambipom and even more Gliscor(huh this one didnt make much sense to me).
Things i like to see in future:
-anime changing formula stopping with all this character replacing bringing some older character developing him more.
Like Misty which story was unfinished on so many levels(even Togepi was left unresolved until Hoenn came on the scene, not to mention her dream),starting with goal of becoming water master which was never expanded enough on(one Whirl Cup and random Seaking contest was a start,but aside from it new ground was never breaked in this field) ditching said character to gym which was never her thing,returning and staying under "poor excuse of sisters not being enough realible"(please this departure could have write a 5 year old child with no build up toward it leaving in last minute,so much about getting any ending).
Nevertheless that way they could develop her more(learning more on her and past),advancing her goal through either water based events or pokethon being good candidate to advertize HGSS(not saying she will,but if writers rather want to use older character both to satisfy older audience,giving justice to her they could use this option),at same time bringing some fresh air and something new etc.
Anyone who wants to argue otherewise obviously didnt watched older seasons not knowing said character and things going for it,or is ignoring everything regarding her pretending like it never existed to begin with.
-giving more references to past and reminders how older characters arent forgotten giving more cameos to May,Max and even some past good rivals like Harley or Drew(eh probably too much to ask).
-anime sticking less with games adding more unpredictabillity in this show.I understand how it has to promote games,but it isnt obligated to follow it in track completely allowing writers to go little of route as past already showed.
Should the writer's show more sensitivity to the older fans, should they base less storyline on games?
Absolutely yes,if it werent for us in beginning days this show would never reach popularity and status it has,and writers should focus on all characters they write or wrote for giving them fair treatment.
Some things really need and deserve resolution from past,no need to repat which ones.