Apple's massive $2 trillion market cap proves Tim Cook's early doubters were dead wrong (AAPL)

· Apple became the first US-listed company to hit a $2 trillion valuation on Wednesday, a milestone for the company under CEO Tim Cook's tenure.
· When Cook took over as CEO, there were many questions about whether the company could continue to innovate without Jobs.
· Nearly a decade into his tenure as Apple's CEO, Cook has...