The v5 version supports the newest processors including the H7 variant with up to 400MHz clock. This comes from PX4, not ArduPilot. And the new Pixhawk 4 is also a v5 board.
The thing is, you have the choice. With these new hardware offerings it looks to me like the community is expanding expodentially, not imploding. If you don’t like v5 then stick with v3. Or even v2, which is actually good enough for “redundancy” if it weren’t for the flash bug. Like sticking all those mags in the v3 doesn’t do any good because everybody turns them off anyway because they don’t work - can never get all the compasses to agree.
As I said, nobody is forcing you to buy Pixhack V5. You have the choice. Without CUAV taking the initiative to build it the choice wouldn’t exist. My personal choice is that I like it and I’m going to put one in a helicopter and test the snot out of it, and I’m going to run ChibiOS on it. If the internal IMU damping is as good as the Pixhack V3 Pro they got a winner. There is no need to declare the community is collapsing under a mushroom cloud just because a new kid shows up on the block.