Poor choices doesn't mean he didn't have a fanbase or wasn't bankable. Yes he was limited to one genre but the biggest superstars like Amitabh, Rajesh Khanna, Salman, SRK also have depended on one genre for their whole career to reach the top.
Only fanbase alone can't help. In the earlier decades Bollywood, rom-coms used to pull the audience the most. And the names that you mentioned above (Amitabh, Rajesh Khanna, Salman, SRK), all of them have had been good at Rom-coms. Among them on Sallu switched his genre to action genre when he noticed that it's more bankable for him.
Had Bobby been stick with actions rather than straying, then definitely he could help himself.
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