I've been in rooms in New York with very smart people who argued exactly this. That the founding of Israel was a mistake and that we should poof it away. (Something about decolonization usually meanders its way in there.)
They're a minority. Like the people who want to relocate Palestinians from Gaza are, to my knowledge, a minority. But they both exist.
Not sure what "minority" you are talking about, because this is actually unfolding right in front of our eyes over the past 18 months with the backing of the most powerful country on the planet. Talking about this as if its some fringe idea is disingenuous.
One, it's not currently happening. It's being actively discussed. But to my knowledge, mass expulsion has not (yet) happened.
Two, many things happen despite being only popular with a minority. I haven't seen polling around Abrego Garcia's de facto kidnapping and illegal detention in El Salvador, but I doubt more than the baseline 20% or so of nutters (a) understand what's going on and (b) support it.
"Approx. 80% of Israelis support Trump's plan to relocate Gazans - survey
"Less than 15% of Israelis believe Trump's plan is "immoral," including 54% of Arab respondents and only 3% of Jewish israelis."