especially if you believe that as in 2016 and 2020, polls continue to underestimate Trump's support.
I'd like to know if this is true for 2024. There are several types of polls, the key ones to this discussion being a poll of all adults vs a poll of likely voters.
In 2016 and 2020 if you polled someone who was not previously political, and didn't vote recently, but supported Trump, then that person probably would not count as a likely voter. That is because that person doesn't vote regularly or recently. Their opinion would go into the all adults category, or maybe the registered voter category. But not in the likely voter category. So, in 2016 especially there was an underrepresented population for Trump.
But, who are the remaining people now that support Trump, will vote in 2024, but didn't vote in 2016 or 2020? Because now in the polls, they would be in the likely voter category if they voted Trump earlier.
Also, in swing states like in NC mentioned here recently, Trump brought in 400k new voters in 2020 but Biden brought in 500k new voters. So, in that state the silent majority actually favored Biden. Anything must then be state-specific to matter. It'll all come down to enthusiasm in November.