It's safe, for some values of "safe." You run the risk that it could burn down, and you can increase that risk by certain charging practices. But as other said, if you keep the state of charge in a reasonable range - no full charges, no deep discharges - you have a pretty good chance of no problem. If you park it outside, and it does burn down, chances are you'll singe the front of the house but not actually burn it down. I park head-in on the driveway so if it goes the back of the car can be opened and the fire attacked from the street.
Yes, some owners will probably give up, especially when they get the recall letter like mine: we're going to replace the battery guts and restart the 8-year warranty, but we don't have the parts, so don't call us, we'll call you. If you're interested in a peppy little EV with reasonable range (same general 200-mile ballpark as a long-range Leaf or an i3, charged to Hilltop Mode/about 90%), that you'll mostly charge at home (DC charging at up to about 50kw is on most of them, but check carefully because it was officially an option), and can keep and preferably charge outside, you might be able to make a good deal on one of those bail-out units. You can bet that the trade-in specialists will. And you'll still, eventually, someday, get the battery modules/cells replaced along with a new-battery warranty. So it's very possible that some Bolts will now be able to test whether the coolant really needs to be changed at 150K miles. It's not without faults (besides the battery), like the front seats, and the dated infotainment, but for the most part it's a very nice little car. No Tesla, but then you're not paying $50K+ either, and I find the more conventional presentation of controls and information (than Tesla's screen-in-the-center) easy to live with.