how long would the Julio-Claudian dynasty have continued if it hadn't been for Nero?

imagine Nero dies of say.... a brain tumour in 51AD, and britannicus becomes emperor, how much longer would the Julio-Claudian dynasty have gone one for?
 
Difficult to say. OTL Britannicus died young so it is hard to say what kind of person he would be. But if he is similar like Claudius maybe after Britannicus Julio-Claudian dynasty might survive few decades longer.
 
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