But yet, investors and Bitcoin enthusiasts like me are beginning to worry if on the long run, China's ban can have a lasting drastic effect on Bitcoin or not.?
The answer depends on why you are asking this.
If you are concerned about the price, then sure such bans have negative effects on the price as they not only slow down bitcoin adoption but also they cause panic sells in the bitcoin market that leads to drops.
But they have no effects on future of bitcoin as a decentralized, censorship resistant currency. In fact bitcoin was invented so that it doesn't care whether some government "banned" it or not! In the end nobody can prevent you from using bitcoin.