Google promised like two I/Os ago that they were solving the fragmentation problem with some kind of new agreement with device makers, but after that we never heard another word about it.
Maybe it's not Google's fault, but that seems like it's skirting the issue: a year after ICS was announced, something like 7.5% of devices are using it, and now we're moving on to JB. We can sit around and blame Samsung and HTC all day, but Google is the steward company of Android and this fragmentation is a real problem that affects developers. If it's creating a shitty situation for developers, it's creating a shitty situation for users.
Maybe it's not Google's fault, but that seems like it's skirting the issue: a year after ICS was announced, something like 7.5% of devices are using it, and now we're moving on to JB. We can sit around and blame Samsung and HTC all day, but Google is the steward company of Android and this fragmentation is a real problem that affects developers. If it's creating a shitty situation for developers, it's creating a shitty situation for users.