This sounds like an avionics issue and it could have happened had it been placed in any plane. It just happened to be a 787. However, news like this is never well received by the market. I guess I got lucky that it happened before I bought and not after.
each plane has different stuff in it, and both all 787s and all other planes using those batteries will be investigated for risk
if the risk investigation shows that the equipment is unique to that airplane, then that will end it. but it's not likely that just one 787 had that type of part in it.
the FAA doesn't fool around. they might not ground the fleet, but if Boeing isn't out-front on this already giving scientifically valid reasons the risk is low in both likelihood and damaging effect, the FAA will ground the fleet to find out why Boeing isn't out-front on it. airplane manufacturers and airlines can get away with planes going down to undiscovered problems, but planes going down from things that happened on other planes will get them into the tightest corporate pillory there is.
if i could, i'd get the FAA to regulate the financial system...but they already know that all problems in the financial system are undiscovered and unrepeatable. it's the nature of randomness.