The first outcome, reduction of payments to the national treasury, would be equivalent to an increase in fiscal spending, and because of this risk the Bank must obtain authorization from the government based on Article 43 of the Bank of Japan Act in order to purchase ETFs and J-REITs.
The second outcome, capital deficiency, could lead to a larger issue, affecting the credibility of the Bank and the  6  BIS central bankers’ speeches  yen as well as the autonomy of monetary policy, if the Bank asked the government for recapitalization or compensation for its loss.