It’s a tricky question, and different people will have different opinions.
One way to look at it is to think of the value of NSR in terms of the expected future dividends. With 15T NBT in circulation, you might expect a low number of dividends to be distributed in future (this, of course, depends on many factors). This means a low value for NSR. But then the NSR burn mechanism can’t support the peg properly, since there is not enough value to burn, which makes the entire system collapse.
This actually might happen simply due to NBT circulation getting too high. @Benjamin studied this and concluded that each NBT in circulation weakens the peg a little more. For a more careful analysis, see Intro to Economics Behind Nubits System and 100% USD Reserves Offers Zero Benefit In terms of Peg Stability.
Even though that’s the doom-and-gloom scenario, I still think it could be helpful to think of NSR value in terms of future dividends.