Don't count on this! In normal cycles, people would drop interviews after they started receiving As due to the time and expense involved in attending them. In a world in which interviews are virtual, there is no reason not to take all interviews, just to see what happens. Someone might offer scholarship money that could be used to leverage money from a preferred school. Of course, some people will drop some interviews later in the cycle, but it is unlikely to be anywhere near as prevalent as in years past.
That said, there is no reason in the middle of October to be thinking about a second wave. We are barely in the first wave, which began in August and will extend at least through the end of the year. Many schools do not offer any As in October, and those that do offer relatively few. By most accounts, many schools have not yet released half of their IIs. It is way too early to be thinking that you need to count on a second wave!!