I think Arecont does continue to innovate. Once other people starting releasing 180 multisensor cameras, they came out with the Omni. First the multi-sensors did not have remote focus, now they do. Then they released the Flex and the Duo series. They've had a pretty robust line of micro form factors for awhile now and lots of options for "inbetween" sizes like 3MP and 5MP and 10MP.
Maybe that's the problem. More dollars go into designing new stuff and the product quality side looses out because of not enough funding. I wonder how many integrators thought, "They didn't work well before, but now they have this new neat camera, and maybe because it's new they improved the quality this time." Quality fails, they are out of favor again, release next toy to regain interest, rinse and repeat.