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Bitcoin is facing lots of technical issues and users ae concerned about it that developers have to address, otherwise other altcoins like Ethereum will take a big portion of BTC's market

I totally agree with you. Bitcoin's portion will go down. However, I think the main reason is the dramatic development of other coins than bitcoin's issues.
Every coin will face issues when develop bigger.

Future will show the true survivor(s)
thank you for dropping by @quangha1710 :)