BoJ's recent and near future policy tightening, like interest rate hikes, can be expected to increase market volatility and could also lead to further falls in certain risk assets & cryptocurrencies in the near term. The potential for a significant market fall, however, is perhaps overplayed- it could be an episodic volatility rather than a systemic meltdown. 

Much of the immediate impact of a potential Dec rate hike is already factored into current market prices, which could mitigate a sharp, immediate shock. What would be more important is the forward guidance and the pace of future hikes in 2026. Lastly, divergence between the BoJ's tightening policy and other central banks like the Fed, which might be cutting rates in 2026 is a key driver of current market dynamics.