In reply to Chuck.

Hooks like you mentioned above can be migrated to a new system, so I don't think that particular example would matter much.

I may have misunderstood what you wrote yesterday though. You mentioned DOM manipulation, so I thought you meant you did a bunch of modifications via JavaScript. But if it's all done smartly via action hooks, then I'd guess that much of it would keep working even after migration to a new system.

The main problems I see with migration to alternative admin system, are that we often rely on query vars and PHP file names to work out where in the admin we are. Those would all break in a new system, unless it replicated all of those (which I don't think it should, since they're mostly shitty legacy things).