To what extent will the economic war (between the US and China) affect its future impact on the bitcoin?
In my opinion, the economic war between the US and China does not have an impact on the price of bitcoin because the war between US and China is something that has to do with the government while bitcoin is decentralized and control by the crypto communities.
I think it because you expect too much from the market due to the upcoming halving which doesn't mean the market won't experience dump in price sometime before it halving.
Will these countries resort to bitcoin to maintain their economic strength?
There's a possibility for bitcoin to maintain the economic strength the individual who is from the US and China but I'm sure it will maintain the economic strength of the two countries since there stance about bitcoin is different.
And avoid economic sanctions among them?
Honestly, bitcoin cant avoids economic sanction for every country is useful to others in some aspect.
Will Bitcoin succeed in maintaining its strength and stability as it is not under central authority?
The US and China are not the only countries where there's bitcoin users or investors and I don't see any reason why bitcoin won't keep up with its strength and stability.