Reading through this thread, I think that if the conclusion is to disallow misaligned 16-bit instructions, then not much has to happen.You technically only need to relink the programs to fix that issue.

The question is really about how far do they want to go beyond just disallowing page-crossing / cacheline-crossing instructions.

Personally, I always thought the C extension would have been much easier to implement if it had certain rules about it. Imagine looking at a random location in memory, how can you tell where instructions begin and end? You can't.