A lot of Strange's power came from him becoming Sorcerer Supreme. =/ I mean, when bestowed upon him, he immediately gains unhindered and unrestricted access to Vishanti powers, that others find a lot more taxing, and... Didn't the Ancient One give him a magical power boost or some crap like that early on in his career?
If you guys remember when the Vishanti said, "Oh ho ho, Strange, NO MORE SORCERER SUPREME FOR YOU!!" when he didn't want to fight in the War of the Seven Spheres, he lost tons of power, to the point he actually had to go replace it with Gaea powered magic.
So no, while I don't like the idea that Strange's power is directly in line with what role he's playing this week, it's not like it's not been done before. =/ Sadly.