What updates would threaten their power?
The current updates would ensure and secure their positions even more.
The game can't be over forever.
If China falls into revolution or economic collapse, their mining community could disappear.
You are assuming the Chinese government will continue to allow their wealth to go into Western hands.
One day, the Chinese elites will have moved all their assets out, and then the game changes.
Power can not last forever.
LTC is just as secure as BTC, since China controls both.
The Blocksize updates (XT / Unlimited), they refused because their internet infrastructure can't handle the increased size.
Meaning they would lose their 51% control.
LOL, if China falls in revolution , we might be looking at a world war, BTC will be the least of my concerns then.
When you watch a race and someone wins, do they keep backing up and rerunning the same race.
No they don't , a new race starts, with different runners.
Crypto will have different runners in the next race , where China has not already won,
there is literally no other way to defeat their dominance in a race they already won.
Power can easily last for a century , so for most it will be forever.