Lots of alternatives available and superior for most specific use cases, which people are discovering and/or transitioning to because of RPi's availability issues. Once this happens it'll be difficult to win those people back.
The real alternatives are many other linux-based single-board computers (from <other fruit>Pis onwards)... sadly most of them come and go, and trying to find a recent OS image (with working binary blobs) for eve a 6 months old devices is proving to be hard.
Right, but people still use the truck, because it's what they know, and maybe because they like the form factor. A lot of Pis are overkill for the projects they're used in. If those projects could start using this, freeing up Pis for projects that actually need them, that would be helpful.
Right now the supply chain problems RPys are so big,that they are reselling RP 4s for over 300 euros!!
Imagine that over night the price of cars go 3x and you have to wait a long time for them.
Different people are finding different alternatives. We also created a very convoluted solution.