Change IS always good. First reason. You fuck up, you learn, You nail it, you learn. Mobas can not have a stagnant meta and thrive. Second reason, A fluctuating meta and balance results in more playstyles and champion picks enjoying viability resulting in a majority of all players having an opportunity to enjoy the game and be strong, Just as each change to the game upsets some one they also will please some one else, the player base is massive.
The games dying... yeaaaaa…. about that. I have seen that claim from season 1 onwards, every single year lol is "dying" a change riot made is going to "kill the game" Look players will come and go, some will stay the entire time others will quit before they ever hit level 10. Far as mobas go, League is still one of the best options out there and its the one I personally find the most fun consistently (I take breaks when I hit burnout and I play fewer games in metas that are unfavorable to me, turns out if you don't make the game a chore you have more fun.)
There is some merit in your complaint about conforming to new player but is that really a bad thing? You run the risk of having new player on your team every game, having league be more friendly to new accounts, quicker champion unlocks, removal of rune/runepage Ip sinks, EXP, Better learning tools, thats all a good thing imo. I don't like getting disadvantaged in a match from teammates, I don't think any one does going off the salt on boards. There is a gap between vets and newbies and I fully support efforts to bridge this gap more rapidly so long as it does not come at the cost of dumbing down the game. Looking at Pyke, and other recent changes to gameplay I don't feel thats happening currently. I don't want to win games simply because I have an old account with all content and some one else does not, thats not a reflection of me being a skilled player its just me being around longer.
I really encourage folks who are burning out, like if 3/5 games are not fun for you, Take a break. Wait for a few patches, come back only when you want to play again, like your fav champ got a nice buff or your fav item build has some buffs. Don't let the game turn into a chore. Otherwise your gonna hit that 5/5 games are not fun, grind away at that not enjoying it and finally give up and quit.