One of these days, I intend to run a Forgotten Realms: Modern campaign, which is set in 2010s DR, more than five hundred years after all the events of the setting we’ve seen thus far.
Nations like Cormyr, Thay, Luruar, and the Sword Coast States exist in a constant detente–a delicate balance of power, much like our own world and the FR we all know and love.
Magic mostly exists these days as fuel for transit and basic life support (heating homes, growing food, etc., like how we use oil in our modern world). There are plenty of people who claim to be wizards, but most “magic” wielded by people comes in the form of limited use items or sleight of hand. Most adventurers are martial types, though there are still monastic traditions.
The gods are by-and-large absent, outside of some odd cults that believe in ancient stories. There are several world religions, which all worship a female divine figure who has various names, but she tends to be pretty similar in the various religions.
The folk have, by and large, forgotten the realms of wonder . . . until a young woman with raven hair manifests silver-white fire from her hands, and magic returns to the Realms.