No one knows what prices will be in 2 years let alone 20.
In any case there is nothing special about current $2 bills. Not as many are issued as for any other denomination but they're definitely not rare.
One Dollar
well i think its worth 1 dollar because it is a one dollar bill.
It is worth face value unless it is uncirculated.
It's worth 5 dollars.
one dollar
One Dollar
one dollar
It's still worth $2.
well i think its worth 1 dollar because it is a one dollar bill.
It's worth exactly $2.
yes
20,000,000
It's worth exactly two dollars.
It's worth exactly two dollars.
Since this bill is not rare and is circulated it is worth face value.
It will still be worth face value only.
It's still only worth two dollars.