After being overwelmed his first time up, he rebounded quite well when he came up for good in July. His contact rate is league average, while his BABIP is pretty good, suggesting he could come down a notch or two--but I don't think so. As you pointed out, he hit 359 in the minors, and finished at 285 for the year after the awful start. That tells me he found his way to the improvement. His biggest drawback is the low walk rate . If pitchers find a hole in his swing he won't wait it out and that may cost him.
With Kennedy likely gone as FA, Kendrick will get 2B out of spring training, with 550+ ABs likely. Based on his track record, which we have to temper based on the line-up he hits in (barring some off-season moves), I would expect to see: .295-15-75-90-15. If they get another producer beyond Vlad, I could see the runs and RBI improving to make him a good lost cost/later round option.