I'm all for it as it pertains to Savage Coil since that's the point and all.

For everything else, I'd much rather not. Being able to crush old content is part of why gearing up feels like you've done something. The other part is of course even being able to take on new content. If they were just going to impose an ilvl sync on everything then there'd be no point in getting new gear, except for Coil. If you're not running Coil then your gear would just be sync'd down in every instance until the expansion (current gear would be sync'd based on how they usually do the dungeon ilvl requirements, never mind new gear -- it would be irrelevant).