and so my point and question is: Regardless what will cause Bitcoin to extinct- whether elementary, apparent or emerging flaws- what will be the fate of Blockchain technology.
Prompt
Will Blockchain technology continue to thrive to support other Altcoins? or the whole concept of decentralization will die with Bitcoin?
You can't ignore the reasons of hypotethical Bitcoin death, because that's the key to your answer. If Bitcoin would die because it would turn out that all the consensus algorithms (PoW, PoS, DPoS, etc.) are inherently flawed, then decentralized blockchains would become impossible. There are also centralized blockchains that will probably be unaffected by it because they have some hard-coded centralized consensus. On the other hand, if Bitcoin would die because some other coins will be overall better, than there's no reason why blockchain technology should be affected.
But this is all highly hypothetical, because at the current moment Bitcoin is the best blockchain application in the world, it's one of the few that are truly decentralized and working, while 99% of other blockchains exist only on paper.