As someone who flies very frequently, these types of incidents hit me right to the bone. The prospects don't sound good....the only good thing is that everyone would have been instantaneously killed with (hopefully) no fire. Horrible tragedy.
It is highly unlikely that lightning would bring down a commercial airliner. I have been on flights that have been struck by lightning before without it becoming a major problem. Weird and a bit scary yes but not enough to cause the crash.
I've been flying throughout this decade twice a week, if not more. But given my former 70+ mile/day commute, meaning 350+ miles/week, I was still far less likely to crash driving 350+ miles/week than flying over 2,000 miles/week.
As far as lightning, it depends on the conditions. Losing electrical and hydrolics in a great amount of turbulence would be horrendous. Finding the black box with its recorded attitudes and altitudes would tell a lot about what happened. Storms over the ocean can be extreme and reach great altitudes. Pilots have no idea how the plane "feels" in turbulent weather when the instruments are useless.
As far as dying instantaneously, that commonly happens when an airline and/or its falling passengers slams into anything, even water, from high altitude. The worst would be to slow into it low speed, and then die from drowning (possibly exhaustion) or dehydration (in salt water, well before lack of food).