Yes it's called boiling the frog + shifting the Overton window. Threatening to invade allies, or having an unelected halftrillionaire direct the government of the US and openly push for regime change across Western Europe (to give two examples from just the past week), would be unthinkable in 2015. Now it's just "oh there's this guy again, anyway what's on" / "mild political irritation".

So yes, you're right that it's a bad strategy to keep the alarmism on 11 for a decade (because this normalisation is what eventually happens), but wrong to think that it's not actually a true problem.