Yes, choice is such a drag. But none of them will go away soon. Especially not SystemTap which has always had a pretty loyal following and dedicated developers to make it work with whatever the kernel provides. Ultimately they will just share more and more features and they will all become more or less frontends to the same backend kernel features. Something like utrace and uprobes will ultimately get supported in the kernel and then the other tools will also get better user space tracking.