Should I pay off full HDB loan if planning to downgrade?

Single, bought my HDB late at 40+ yo, took CPF loan because not cash-rich then. Planning to downgrade after retirement (15odd years time). Hoping that the Silver Housing Bonus or something similar is still availble then. Should I (a) try to pay off the full loan amount for current flat (b) switch to bank loan now that things are a little easier for me?

A few factors to look at:

1) Your outstanding balance/remaining loan years? Banks may not take refinancing/repricing < $100,000?

2) What is your objective of paying off remaining loan / refinancing? Is it to save on interest payment (how much is saved) or CPF accrued interest? OR just because you don't want be in debt? Is the spare cash better to invest elsewhere or?

3) When things are easier - does it mean your work is stable (no risk of being retrenched / lost job) hence can switch to bank loan - banks are less merciful when you can't pay up loan instalments/interest. HDB's objective (HDB loan) is not profit-driven so more merciful. To save on interest - definitely good to switch. Compare this risk to item 2 (vs savings).

My opinon. I will switch to bank loan, becoz less interest, drag as long as i can to pay off the mortgage, even i can pay it off sooner.

Why?

1) Becoz if the total payment of the house is $800k, if i die before the loan tenure, maybe i only paid $500k i saved $300k.

2) housing loan 1%+ interest VS investment, if i paid the instalment using CPF OA (with an interest of 2.5% p.a.), then i top up cpf every month, i still earn $$$.

3) HDB is a depreciating asset over long period of time. I would rather leave cash than HDB to whoever taking over.