I wish people were (1) more honest, and (2) more reasonable.
The reason I would object to the courtesy of ages past is that it often obscures the true, unpolished character of a person. Yes, we might make nice, but what if we actually hated each other? Let's be honest about who we are and what we feel. However, the reality of human unpleasantness is hard to reconcile with my second wish. You could say I wish all interaction to be honest, yet calm, reasonable, and respectful. In that sense, I guess it does approach Victorian genteelness--no fist fights or backstabbing, ladies and gentlemen. If you wish to express your dislike, do so in an eloquent and effective (yet non-extreme) way. Unreasoning actions will not be tolerated.
When we look back, those Victorian attitudes may appear charming, but they also could conceal the festering racism, sexism, and other forms of prejudice and hatred that lay beneath the politeness. Things weren't exactly politically correct back then. If we want to revive the gentleman and the lady from those days, we will have to eliminate the unacceptable parts of the persona. No snobbery. No belief in others' inferiority. The modern man and the modern woman consider all to be equal.
As for your points on dress, you, sir, are welcome to adopt the handsome jacket, hat, and pocketwatch of the Victorian gentleman. But for God's sake, don't expect us women to start donning the corsets, petticoats, and hoopskirts. If you take offense to the revealing clothing of today, express your distaste for the wearer's choice in attire. But do not confuse dress with their character. Remember, as a gentleman, you are to be respectful in all situations. What someone has on does not earn one's eternal disgust for that person.