> Can anyone offer a good reason why I should stop worrying?
There will always be a shiny new tool, no matter which one you choose. Good products can be built in any of them (even Knockout which I loved too). Most of the frontend fatigue is just paradox of choice. For me what works to reduce paradox of choice is knowing that good architecture and clean code is much more important than the selected framework. Most of them have a lot of documentation, examples, so we should focus on creating good products, and again, most of them can be used to created high quality web apps.
There will always be a shiny new tool, no matter which one you choose. Good products can be built in any of them (even Knockout which I loved too). Most of the frontend fatigue is just paradox of choice. For me what works to reduce paradox of choice is knowing that good architecture and clean code is much more important than the selected framework. Most of them have a lot of documentation, examples, so we should focus on creating good products, and again, most of them can be used to created high quality web apps.