This is indeed a struggle for you. I’ve experienced similar struggle too - the 半途而废part. But no one will know for sure if this will happen, so as long as he is interested to play, I think getting the piano is worth it. Can always sell it off when his interest dies down.
Also, he can learn many lessons from this. If he becomes less interested, lessons about perseverance and not giving up can come in. ☺️
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