it is not a bad idea, but there are some things you should consider first, in that way, you can lose a large amount of profits that you can earn by holding hold of potential coin alt, and you can lose a large amount of capital that you've saved it in alt coin, and selling it for a low price, that's some risk that might happen, but if we can manage it well I think why not try it, bitcoin is currently in very good growth and bitcoin value veryhigh, taking a bit of a risk to double profits
It is really not a bad idea most especially if you are holding some shitty coins. Some may take a very longer period to recover and that is not good.
The best thing is to sell those shitty coins, hope to get some little bitcoin to get the bitcoin gold equivalent of it and then buy some of the altcoins that can quickly get back up pretty fast after the fork.