Spot-on. I did this on a team I was on, and it was an excellent (and fairly quick) exercise.
One thing you should also do is make sure that stateful components--perhaps something a little more complex than an input or button--can interact well with the rest of your application in a given framework. In my experience, any framework will get you off the ground with a simple app in a couple of days, but some frameworks (notably Angular) do not play nice with anything outside of their own walled garden.
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Spot-on. I did this on a team I was on, and it was an excellent (and fairly quick) exercise.
One thing you should also do is make sure that stateful components--perhaps something a little more complex than an input or button--can interact well with the rest of your application in a given framework. In my experience, any framework will get you off the ground with a simple app in a couple of days, but some frameworks (notably Angular) do not play nice with anything outside of their own walled garden.