Bitcoin real manipulation haven't really started.
Nothing is real manipulation. Manipulation exists in all markets and you can not say real or fake manipulations because of actual manipulations in all markets. You only recognize it or not, but it is always here.
In the future when BTC gets to a certain price point and the price start to get stagnant, also there isn't much coins to mine or maybe the mining ends.
If people think of a time when Bitcoin mining ends, they think of a future when Bitcoin blockchain is dead, and they have no convincing reasons to invest money in Bitcoin in 2025.
The only way to make BTC more interesting again is reset, I don't know how this will go but I believe this will be the only way for future whales and men in power to make money, they have to create a mess for holders to dump, lies will actually be more effective then.
If the game is reset for one time, there will be more resets in future and this game will become boring, dangerous and no longer good for investors. If a blockchain was rolled back, community have reasons to think of possible rollbacks in future.
Bitcoin blockchain has no rollback since 2009.
It has no reset so far, and I hope there will never be a reset like your suggestion.