Longwave will probably never be used for broadcasting here because it is being used for aero-nautical navigation beacons and DGPS.
"[T]here are almost no LW receivers in the hands of the general public."
Many of the better Radioshack SW-MW-FM radios had/ve LW for years. A number of the Grundig portables (like my Yacht Boy 400) also have it.
But how many of these receivers were actually sold? Compared to consumer AM/FM radios (and those are becoming fewer and fewer), I'll guess that they're a very small percentage.
"Outside of two-way radio and religious propaganda broadcasters aimed mostly at Africa & Asia, and aircraft/marine/military backup systems, the lower frequencies are pretty much dead now. Satellites and the interwebs made them obsolete."
(corrections are my own.)
No, increasing amounts of poorly-regulated electrical noise from poorly-constructed and shielded electronic equipment did that. The only thing satellites and streaming did was make it irrelevant for domestic broadcasting.
That certainly hasn't helped, but if anyone cared, those devices would have been redesigned, fixed, or replaced decades ago. But AM has been on a downward spiral for 40 years, and shortwave hasn't been in the mind of most non-hobbyist American consumers since the '60s at the latest. World War II is over. So are the most of the old-time international broadcasters.
It doesn't matter anymore if electrical devices spew their garbage all over the place. Comparatively few people are listening to frequencies below 88 MHz. Other than a few hundred AM stations that are still successful (and that number continues to drop), the lower frequencies are completely out of the American mainstream now.