I think, yes. Bitcoin is the king of Cryptocurrency. But every king required people or community to establish a better nation. So Bitcoin also needs other altcoins to build a cryptocurrency community. Because everyone doesn't like bitcoin features. The other altcoins can come with the different features and advantage where they can attract layman or those community who are in the oppose of Bitcoin.
According to me, there is no need to fork Bitcoin but yes we need altcoins who can change the economic inflation and models. The altcoin should have the power to knock the regular economic model. It should be the combination features like a fiat currency (USD or EUR) and Bitcoin (Decentralization and security).