Not really. It's not like NORDO aircraft collisions are an everyday occurance. Really, a lot of us fly planes that are minimally equipped quite a lot. It's not statistically as bad as it looks.
Got curious about that.
The NTSB accident database has flags for midairs. I searched for them in my 2008-2020 database, and found 289 total aircraft involved in midairs, with 144 total midair events. This includes the foreign accidents that sometimes get listed in the NTSB's database.
(Why the odd number of aircraft? See CEN10FA115. It was a "three way," with a Cirrus running into a towplane pulling a glider).
There were about 22,000 total accidents in that period, meaning midairs are involved in roughly 0.7% of the accidents. In 62 of the 144 midairs (~43%) no one was killed. Another 26 saw only one fatality, so there's a 50-50 chance you'll survive a typical midair.
Fifteen of the midairs involved planes trying to fly in formation or as a group flight. These were NOT just homebuilts. Surprising variation. In a couple of cases, the intent was to take pictures. Couple of balloons bumping together, a few cases bumping into drones.
Nine midairs involved gliders. In four of the cases, gliders bumped during soaring competitions.
Skimmed through the listing to find cases involving NORDO aircraft. Nine cases (not including the foreign accidents). But....
One involved two ultralights. Three cases involved powered parachute aircraft. Another case involved two crop-dusters running into each other, Another involved a glider with its own tow plane. None of these cases involved collision with a Cessna, Piper, etc.
So of those nine NORDO cases, only three were what we would consider "conventional" NORDO...an antique, classic, or homebuilt aircraft without a radio. They were a pair of float planes (Super Cubs) taking off from a lake, a Pitts Special and a Piper Cherokee, and a Taylorcraft and a Cessna 185. That's three cases in thirteen years.
Not much of a risk, and frankly, I doubt there many new pilots willing to fly without a radio these days. It's not like the ranks of NORDO drivers is increasing.
It's kind of difficult to establish the degree of communication involved in the remaining cases. If the pilots are killed, it may be difficult to establish whether they made position calls. I found definite claims of both parties making position calls in 27 of the 144 cases. In a couple of instances, the pilots admitted they'd dialed in the wrong frequency.
The NTSB record includes flags that tell what the phase of flight was for the midairs. The results were kind of interesting.
The "occurrence phases" are the NTSB's terminology, not mine. Sure, there are plenty of cases related to traffic around an airport...but note the various "enroute" categories and the "Maneuvering" categories. Over half are happening OUTSIDE the traffic patterns. Some were in conventional cruise, but it seemed many happened in practice areas. Radios aren't likely to help as much, though ADS-B out *and* in might help, especially, if all the local FBO's aircraft are so equipped.
Ron Wanttaja
. I very rarely find traffic that I see on my ADSB, which make me nervous that if I see traffic close enough that I have to take evasive action I’m probably already in the Sh$&!t. I don’t know how the Cub takes off and goes through the pattern area (which they all know about ) without any way to monitor what’s going on in that airspace? 
