Wall Street is overlooking a key indicator that may send Apple's sales soaring.

The market was unimpressed by Apple 's ( AAPL 0.64% ) product rollout on Tuesday.

"Apple's not really innovating," was one analyst's reaction. "We were like, 'meh,'" said another. On Wednesday, shares of the tech giant fell more than 5% from Tuesday's pre-rollout high, and remain down more than 6% year to date.

Here's why this might be a great time to buy the stock.

Slow and steady

In the famous Aesop fable, the "slow and steady" tortoise beats the fast-moving hare in a race. But that's not the way things usually work in the tech world.

Investors are constantly clamoring for big new innovations and bold new designs. But for the past several years, Apple has only offered incremental upgrades to i

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