Realistically, when you look at his % improvement by half season, his biggest leap was from his first 8 games year one to his last 8 games year one. Each 8 game increment he's had between 5-15% improvement in QB rating. So it's not out of this world or unforeseeable. It's actually pretty black and white, he keeps getting better by about the same margins both year to year and within each year.
But yeah, to predict this, no. Did I'd hope he's be this good by year 5? Yes. Was I hoping for top 15 play this year, not expecting top 3 play? Yep. But the upward trend is right there in black and white. Every 8 games, constant growth and improvement.