That sounds like a failure to me.
If this was 70,000$ FORD that had to have its engine replaced 2-3 times then people would be screaming LEMON. But since its Tesla - it is ok somehow.
Anyway what matters for taxi driver is the cost per mile. Tesla spending: 70,000 + 3,700 (electricity) + 7,000 (repairs) = ~ $80,000 Toyota camry spending: 23,000 + 10,000 (gas) + 2,000 (repairs) = ~ $35,000
Tesla: 80,000$/100,000 miles = 0.8 USD/mile Toyota camry: 35,000$/100,000 miles = 0.35 USD/mile
Cost per mile driven: Tesla > Toyota by 2.3x
Total cost: if he was to sell Tesla today he would lose $35,000. If he sold camry today he would lose $13,000
Financially Tesla still does not make sense.