Earlier quoted context omitted.
Well, it's not so clear cut. If you live your life according to a Mediterranean lifestyle and drink your glass of wine each day (mostly in a social setting, which is especially important when you grow older), you will be healthier than most other people.
If you live that same life and drink a glass of grape juice instead of wine everyday, you'll live even longer. Alcohol is a poisson and there is no "safe" level. Now, it's a personal decision how much risk is acceptable to you, but don't lie to yourself how "one glass a day is not going to make a difference".
For the other it is not replacement in any meaningful sense. The equivalent amount wont stop your thirst and one cup of grapefruit juice feels like you have drunk nothing.