If they are a long-term investor, yes but for a short-term investor, they can't afford to wait that long but they will only sell after a couple of months. For them, time is important more than the extra profit but I think they still can be able to earn more before those long-term investors sell their coins and make a profit, as long as they will buy back again right after they sell or they can wait first for the price to drop a little.
Ideas like this are usually used for bitcoin investments, for the long and short term bitcoin can always be relied upon. Even though at times in the short term bitcoin is very close to volatility, meaning the tendency to maintain investment value and as many people hope, the best step is to hold bitcoin in the long term.
Because what I understand, only bitcoin can be relied on compared to other existing cryptos, besides being able to maintain the investment value, bitcoin is also the best investment at the moment.
The halving is for BTC so BTC is the one that is expected to rise. It's important to max out this coin first before anything else. Maybe after the halving, that is the time that we can properly divide our funds to some other cryptos.
The market trend usually always follows bitcoin, when the recovery process is going well for bitcoin and that's when potential crypto will also follow it, maybe people's tastes will vary, but I think Ethereum is a good choice to use in investing.