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Possible maybe, but such a coalition would either involve the Greens, who are absolutely despised by parts of the Union to the point of Bavarian Minister-president Markus Söder declaring them their main enemy and ruling out any coalition, or the FDP, who sabotaged our previous government, caused its collapse and is thus hated by the SPD. The BSW is not a realistic coalition partner with its Pro-Russian stance. So any option for a 3-party coalition would likely result in a lot of conflict and chaos in my opinion. Chaos which the AfD can use to its benefit.
Only on a very surface level, as in “the far-right reached second place in an election again”. But other than that, no, the situation in Germany is not very comparable to the late Weimar republic at all. Party militias aren’t terrorizing the streets, there is no hyperinflation, we’re not geopolitically isolated and our constitution is not as flawed and weak. Not to say the situation is rosy, but pretending we’re literally at the inception of the fourth reich is not realistic or useful.