Exactly. An increased money supply means there is more debt to pay interest on, and the only way to pay off that debt is by increasing the money supply further.

In a world with $100, if the $100 is debt (as fiat is) and the interest rate is positive, let's say 3%, $103 needs to be paid off after a year, and $103 can't be paid off if there is only $100 in existence.

Nothing stops this train.