Will Google's Fuschia replace Android? My guess is that if Fuschia is successfully developed it will become the standard for who would want to stick with Android, with related softward that does not easily convert to Apple Mac, for example? The whole idea of Fuschia is that it will work on all platforms.
Android does not, so that immediate and huge disadvantage must surely render it obsolete. Once an advance has been made, no-one wants to go backwards, or even to stay still. The question is, can Fuschia do the job that Google wants it to?
Yes. Android is by far one of the most recognizable and used software of the world. It is to mobiles what Windows is to computers. Android is one of the most critically successful pieces of software ever coded.
The problem is that Android is a robust and programmable OS. Yes, they are positive traits but they prevent the company owning it from having much control over what it's buyers do. The reason Android looks different in every other phone is that the companies buying them bend it to their will. This has led to fragmentation of the software into various mutations of its own self. Google is not having any of that anymore. They want to unite their software in a way like Apple’s IOS.
Apple is Google’s biggest competition in the phone OS market and app developers prefer IOS for designing due to its simplicity. There’s a reason why apps hit the iStore before coming on to Android. Other than Google wants Fuchsia to have its own unique coding engine to decrease development time and promote app development on its platform. There are other ‘drawbacks’ to Android but the main reason why Google is creating Fuchsia is to make a profit and also give a competition to the IOS.