First of all, I have to admit that since reading the OP, I have made rosemary roasted potatoes and a huge batch of roasted vegetables, because they sounded so good, I couldn't wait until a holiday to eat them. So I think the OP's planned menu is quite delicious.
However, I'm wondering if the real point of contention is that the menu, while it has most of the traditional foods, has almost none of the traditional preparation methods. I think it's the amount of difference between the standard, traditional fare and the OP's menu that would cause issues.
We've changed holiday traditions in my family, but we've changed them slowly, a little bit at a time. Eliminating so many traditional dishes at once would cause an uproar with some of my family. Changing them one dish a year, giving people a chance to have input, would work more smoothly. We usually have one "experimental" dish each year at Thanksgiving (last year, it was the green bean casserole, because we'd never, ever had it). We all try it. At some point before the next holiday, we decide if we want to have the experiment again. In the case of the green bean casserole, we decided before leaving the dinner table that none of us liked it and it would not be a repeat.
My brother usually puts some surprise ingredient in the stuffing and we spend half the meal trying to figure out what the heck it is. We've vetoed some of them, like pretzels, but have allowed him to continue with others.
