Wow.
General purpose rant:
This is exactly the kind of thing that SB can and should PRE-WARN users about. If you’re going to drop such support you should advertise as such at least a YEAR ahead of time to give users time to prepare.
This is the kind of issue that you may not even be aware of until it bites you in the ass a year -after- you upgrade and don’t realise you’re screwed.
Said it before, say it again: BACKWARD COMPATIBILITY should be a -much- higher priority throughout the audio/video industry. The idea that a project that is less than 10 years old may be unreadable is ridiculous.