Think about this for a second....The PF is an investiment account with annual earnings pouring over into an earnings reserve account. Note, the earning reserve account is not a savings account, it was never set up as a savings account, as half the earnings are plowed back into the fund and half are used for dividends. 
Now, if you want to purchase a truck with a reserve fuel tank, but dedicate the use of the fuel in the reserve tanks for when oil reaches 140/bbl, even if the main tank is dry, and you're stranded in the desert in 118f heat, that's your perogative. Likewise, the legislature can repurpose the results of the earnings reserve by pouring it back into the PF. But I caution, the PF is not a savings account, it is an investment account that goes up, and goes down, but it is never a savings account.