I am not a fan of exact re-releases, but I would not ring the doomsday clock because of this one. LEGO will obviously not remake every set, not even every successful one. For every re-release of an exclusive there will be at least 10 that will never see a new release.
So, what do we see here? The timing indicates that this does not take a place of a new exclusive, and since no designers spent unnecessary time on it, it can be considered as an extra in the release schedule. Thus, the complaints about LEGO losing its creativity are not warranted, like in the case of Winter Toy Shop. I would also say that it likely will not stop a new landmark from being released, as this is clearly for the fans only, as otherwise LEGO would not try to attract new customers with dated looks and building techniques.
Then, what kind of exclusives are usually re-released? From what I see, they need to be either:
Core elements of licensed franchises that are evergreens, and without any alternatives in the same franchise that have iconic enough status to make a large set sell well. Right now these are mostly SW vehicles.
Sets that are iconic due to collectibility status and historical rarity, but they also need to be great on their own terms. Taj Mahal is one of these.
About Winter Toy Shop: it did not fit any of the above criteria. Plus, it came instead of a new set. And accordingly, it caused an outrage. LEGO admitted that they made a mistake, and based on this, it can be said that LEGO will be afraid of releasing old sets that would take the place of a new one in a series or a release schedule. Any re-release that is not of a highly hyped set without any significant updates must only come as an extra in the release schedule.
Then look at Taj Mahal. For LEGO, it must be an easy and cheap to produce sets due to the relatively small number of unique pieces. If it had lots of unique elements and minifigs, it might not have been re-released like this. I think its homogeneity was a huge factor when 10256 was considered.
What does all of this mean to us? Well, due to the current market conditions, it is obvious there will not be new sets as desired in the long run as Taj or the Falcon. Therefore, they will not get a re-release due to some iconic collectibility status. So what is left is core franchise sets. If you avoid those, you can make a moderate profit if you play well.