Choice is mandatory, there is no default. If all players forget, forcing one choice or the other on the victim is not a suitable remedy.
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Leandro
G2Camarilla Malkavian Inner Circle: During each other Methuselah's unlock phase, if Leandro is ready, that Methuselah chooses either to burn 1 pool or to lose all transfers during his or her next influence phase. +2 bleed.
Rulings
When a Methuselah decides to get no transfer, he can still use other effects that put blood on his uncontrolled vampires (eg. Govern the Unaligned, Powerbase: Montreal).