The other thread is not bad and has earned you some merits but I would recommend you not to open too many threads just expressing what you think or people may get tired of it.
They will never feel tired of it. 
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That said, you are probably right that if it were not for Bitcoin the cryptocurrency industry would have gone much further downhill and possibly collapsed, although it is very difficult to make any claims about what would have happened if what has, in fact, happened had not happened. It enters the realm of pure mental philosophy or speculation.
History has been made and Bitcoin has set up solid foundation for evolution of blockchain industry, even it is not a first cryptocurrency [1]. We can assume, if Bitcoin had not succeed, there would have been another cryptocurrency achieving the success of Bitcoin.Reality is Bitcoin already did it and so far, since 2009, there is no other cryptocurrency can surpass Bitcoin.
About decentralization, only Monero can have it but still can not compete and take over a King position of Bitcoin.
[1] Bitcoin prehistory