You've got an idea: a new way of doing things; a change; a paradigm shift. It might work, it might be no better than what we've got already, or it might end up being a disaster.
The honest way to present your proposal would be to admit its novelty, and hence the uncertainty: this is a new idea I had, I can't promise anything, but here are my reasons for thinking it's worth a try, here are the likely costs and benefits, here are the alternatives.
However, let's suppose you don't want to do that. That's hard work, and if your idea is crap, people could tell. How else could you convince them? By making it seem as though it's not a new idea at all.
You could dress your idea up as:
the glorious past. Your idea is nothing more than how we did things back in the golden ...
