I've been following this thread with interest. I am not really "for" or "against" the idea in principle - I support change if they make things better. That being said, a few observations:
1. We need to be careful when making a zero sum game out of proposals for new projects. Instituting the executive curl did not - likely (I could be proven wrong) - require hundreds of man-hours of staff work to be siphoned off from the AOR replacement project or a diversion of funds that could have put an extra hull in the water. Saying that costs in smaller ventures like these necessarily require operational off-sets is, as T2B put it, arguing somewhat to the extreme.
2. That being said, there are costs, as Edward's post above illustrates. We can say there is a bit of a formula for "change" - it requires time (ie: manhours for staffwork), resources (ie: money), and political capital (ie: your boss and his boss's time and energy). The executive curl is a good example to work with. On a scale of 1 (least) to 5 (most), it probably cost 1-2 in terms of all three factors. Introducing a new fleet of fighting vehicles into the Army, conversely, is likely 5s across the board.
3. This, like the executive curl, or renaming an Air Force Squadron or putting the Army in khaki uniforms all constitute tinkering. I'd consider tinkering to be changes that are largely cosmetic - in the end, they don't have immediate or secondary effects on how we do our jobs. Many point that these changes are easy - if they are so easy, why aren't the very smart Admirals and Generals instituting them now? A better understanding of tinkering, its advantages and disadvantages, and why we choose to do it or not would probably add to this discussion (which isn't so much about a ship flag, but rather the value of the impetus to change it).
4. If the formula for change is valid and the principle of tinkering makes sense, then I guess we get a better idea of the cost:benefit relationship. Are the resources expended for the sake of tinkering (which usually isn't much) worth it? I don't know, but it's probably worth trying to figure out.