Pilots kill helicopters. Helicopters don't kill pilots (except in very rare instances).
Enstrom has produced 1,300 helicopters in it's entire history. Robinson over 12,000. Say what you want about Robinson, but they must be doing something right. While I would like nothing more than to be flying around in an AS350B3, or a 407GXi, I am extraordinarily pleased with the performance, comfort and economics of the R44. There is an Enstrom 28F that is kept in the same hangar as my R44. The Enstrom is always in maintenance, rarely flies, and obtaining MX is an ordeal compared to the plethora of Robinson MX shops. Putting three in it is another kind of ordeal, four is, of course, not possible.
While there is much to like about the Enstrom rotorhead and control system, that is probably the only good thing about it. Swinging those three blades around is asking a lot for a small Lycoming. Even with the complexity of turbocharging, performance suffers dramatically at max. gross weight compared to the R22. We see some of that same issue in the Cabri G2, but of course the Cabri employs much more modern technology and is only a little less powerful than the R22. In either case, how can the Enstrom design compete?
Poor design and management also kill helicopters. The company was always a hobby time affair,
passing through the hands of so many owners, none of whom were ever successful in motivating a marketable design. Dean Kamen came close with the 480, but a cabin perfect for low cost training became a bizarre aberration in an attempt to sell it commercially when the military didn't want it. Perhaps he was too distracted by his other failure, the Segway, which was occurring at the same time, to really take the 480 where it needed to be. Again, market share tells a story. 250 480's total since 2000. 1000 R66 since 2007. And 505 production is banging right along at 200+ since 2015, perhaps it will ultimately overtake the R66. I don't have the data, but it is easy to suspect that 480B production fell into the low single digits per year when the R66 was released. With both the R66 and 505 available the 480 was and is as doomed as the 28 and 280.
Perhaps the company will change hands again and the new owners will be more visionary. But the new vision would have to be very compelling in some way given Robinson and Bell's lock on the low end market.