At the end of the day, the battle was lost in 1453.
The best chance there was to reclaim Constantinople for Christendom was in 1917.
Admiral Kolchak was to command an amphibious assault on the Bosphorus, spearheaded by regiments named after Tsargrad and Admiral Nakhimov (amongst others).
Instead, it was Russia that was taken over by proto-SJWs, who a decade later would topple statues of Admiral Nakhimov to avoid offending visiting Turkish sailors (yes, really).
At that time, there were ~180M people in Russian Empire in 1916 (~95M Russians), as well as 10 million Greeks and Armenians in the region, vs. just ~13M Muslim Turks in Ottoman Empire. Today, the relative numbers hardly need recounting. The fantasy only exists in Alt Right memes.
So who really cares if it’s a museum or a mosque at this point. Tourists will still be able to go there and snap selfies, so it’s not as if anything will really change with this reversion to the pre-Ataturk norm.
The contrast between Turkish-Islamic civilizational vigor vs. the sight of the Western world toppling the monuments of its founding fathers obviously begs to be made, though the cynic may rejoinder that it’s more of a banal ploy by Erdogan to divert attention from the state of its Corona-wracked economy.
That said, I suppose if one really wants to assign it cosmic significance, one may view it as God’s righteous punishment for reserve Turkish Army officer Bart’s pretensions to inter-Orthodox primacy and support of the heretical Ukrainian schismatics.