The story is a bit more complex than that. Günter Schabowski, who announced the "new travel law" as they called it, only got a note right before a press conference and wasn't properly briefed.
He was then asked when that'll happen, and he said something along the lines of "according to my knowledge immediately", which was interpreted as "we can go there right now, tonight", but which wasn't what was planned.
This eventually led to a situation where thousands of people were standing at the border, wanting to cross, and eventually the border guards saw no other option than to let them pass.
Its days were numbered -- but the system could have easily come crashing down very violently, or remained intact but with a massive crackdown (in fact the party leadership was making explicit plans or the latter of these -- "Day X", as they referred that eventuality -- while a "Chinese Solution" was a tacitly acknowledged outcome as well). And then plodded along for another 10 years or so. That's why the events as they unfolded were surprising.
In hindsight, considering the modern rise of the AfD in German politics, and various other oddities now and that will arise in the future, perhaps a gradual wind down transition would have been better.
The lack of a Deng Xiaoping equivalent figure in Germany meant that the old hardline party core, and the favourable to Russia fraction of the population, were never mollified. It was a sharp and abrupt transition for them.
AfD support is definitely stronger in the East, but it is not exclusively an Eastern party, and (unfortunately) has very significant representation in the West as well -- and in fact more supporters in the West than in the East (though percentage-wise the support in the East is much stronger).
It's also not a "nostalgia", or regional grievance party in any meaningful sense.
In other words, observations in the parent message that you are vociferously attacking ... are basically valid.
If you're genuinely unaware of these facts, I would suggest you attempt to inform yourself at a level beyond that of a few casual keyword searches.
To be frank, considering the use of a pseudonym and comment history, I'm going to assume whoever is behind this account is intentionally writing in a provocative manner, perhaps to earn karma quickly or some other reason.
Breaking the HN rules and guidelines is quite detrimental when your already starting off with lower credibility.
Unfortunately, in the message I was responding to, you were (1) accusing another user of gross ignorance, while (2) in regard to the subject matter, demonstrating extremely superficial (basically inadequate) knowledge of you were talking about.
So you were provided with a necessary correction. To be frank, I'm not sure what other kind of response you were expecting.
East Germany has continued being economically weaker than the West, which would make them more prone to more radical ideologies in the absence of the prior far-left one. If anything, a historical gradualist Deng Xiaoping figure would mean acclimation and full development towards a finding a self-sufficient niche in a globalized market economy, not a wind down from hardline pro-Russian party apparatuses (who apparently were responsible for a post-unification far-right party?). Many dissatisfied East German youth would support the Euroscepticism of the AfD because they haven't experienced the full promises of prosperity from the collapse of the DDR and the victory of the West-led order.
It doesn't have to be China. There are far smaller countries in Europe that are perfectly viable, and even countries that aren't viable, like North Korea, can still continue to exist despite that.
In this case, it's good that it happened so fast. It could have gone a lot worse.
Hardly any state in Europe can afford full self-sufficiency in isolation without enormous suffering.
North Korea (with more population than DDR) survived Soviet collapse but just barely, losing hundreds of thousands in a protracted famine, until landing on client relationship with China. Not a realistic scenario for East Germany.
This eventually led to a situation where thousands of people were standing at the border, wanting to cross, and eventually the border guards saw no other option than to let them pass.