People who knows what is mining will not buy ASIC, because ASIC can do one thing, and will always have a better ASIC in the future.
But GPU can resell, and can switch to other algorithm.
Any ASIC will be trash in a few year, but GPU won't (at least slower than ASIC).
yes, I give my suggestion to my friends which want to start mining the coin. I tell them to not to buy ASIC because the choices to mining coin are not much depended on the GPU. and like you said, if we don't need that GPU, we can sell it to another gamer or another people which want to buy GPU. with GPU, we can have many coins to be mining and we can move from one coin to another coin beside that, we can build one rig with many GPU and of course, the hashrate will bigger too.