If investors want more options, why not utilize that savings account option that sits idle. Change it so if someone decides to use the savings account, they get a higher interest rate.

This would be so easy and I've spoken to it many times. All we have to do is take the 15% interest given to stake holders and move that inflation to the bank accounts where they belong. It's the obvious logical move.

Right now we get less than 2% interest on our stake from the 15% of inflation feeding into that interest. That <2% interest would skyrocket to a huge number if applied to the bank accounts, because no one uses the bank accounts. Moreover, money that moved out of stake-holding and into the bank accounts to capitalize on this huge amount of interest would give all the existing stake-holders a stronger upvote.

It would basically be the same thing that SteemEngine does via virtual mining.
It's a win/win for everyone.