I was basing that concern mostly on bad reports of the Leaf battery, good reports of the Tesla battery (someone put together a data set of range loss vs mileage) and lack of data on the Bolt.

I haven't seen data yet on the Bolt. The other child comment suggests it's favorable, though. If new data shows the Bolt as having similar longevity to the Tesla then it's more of a contender for me, although I don't think highly of GM or their cars in general.