His career is all but finished now. He picked up a serious back injury almost two years back and has been out of action ever since. Even if he returns at some point in the future, I don't think he'll be able to bowl at the same pace. The last time I heard, he has injuries to his ankle and heel as well, in addition to his lower back injury.
He is just 19 years old and BCCI is taking good care about his treatment and medical expenses and he might not bowl at the same pace but that can be said only after he starts playing again, hope you remember Shane Bond and he was one of the most talented bowlers who could bowl at 150 KMPH consistently and he was also hampered by injury throughout his career but he never reduced his pace till the date he retired from cricket
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Pace bowlers have always faced this problem. Injury is something they always face. Only some bowlers have played consistently. Since he has faced injury already, likely to be shorten his career. I wish India could produce such a speedy bowler.
Mustafiz was a great bowler when he came. But later, after a surgery, he is not anymore able to deliver the same.
There were plenty of tear away fast bowlers who showed promise when they started playing and injuries cut short their career and the only fast bowler i know who never missed a match due to injury was Kapil Dev, rest of the bowlers had some sort of injury at one point of their career.