dvdisaster as a complement to quality scans

Quality scans, e.g. C2 error or PI/PO scans are a valuable tool for testing the results of the media writing process.

But quality scans are not a reliable means of predicting the lifetime of optical media.
Consider we are looking for the right time to copy a worn-out medium onto a new one:

Too early: Copying media because of a bad quality scan is cost-ineffective. Sometimes such media remain readable much longer than expected.
Too late: When the quality scan reveals unreadable sectors some data has already been lost.
Right before the medium fails: The ideal case, but how to tell?

However, we could do it the dvdisaster way:

Create error correction data for the medium.
Scan the medium regularly. Use it until the first read errors occur.
Recover the read errors using the error correction data. Write the recovered image to a new medium.

Pro and con of dvdisaster at a glance...