You're kidding yourself if you think a 4x wdc is not world class. His win in 2008 at Monza, those throughout 2009 and the come from behind victory in 2010 show that he's clearly a world class driver.
In all honesty, he needs a break to re charge. He's been racing in F1 since he was 19 years old. The demands and stress that puts on your body is not good for anybody. Lets not forget its only been recently that drivers have been picked up more frequently at 18/19 to race in f1. Previously it was 22-24 when you'd get a gig and proven yourself as a top line driver.
The other argument is that he's spent the last 5 years trying to drag performance out of Ferrari. Its all well and good when you're the dominant car, but even Schumacher would have argued that the last two years at Ferrari when he wasn't the dominant force was draining.
Ok, maybe saying he isn’t world class wasn’t correct. But he lacks that last bit that I feel the greats have. Like I said, he was a great driver. I was super excited to have him in Ferrari when he joined. Him not winning a WDC while at Ferrari isn’t down to just him but also the general incompetence of Ferrari recently. But like I said, he needs time away from Ferrari to regain his best form. Which is why I suggested something like McLaren/Renault as a good fit. Not the ultra demands of Ferrari but still top tier teams with high expectations that could use a 4x WDC to maybe propel them. If he were to turn it around at Ferrari itself, that would be the best scenario. A flying Vettel and Leclerc would be one of the best driver lineups on the grid.