Agreed, hours are what the burndown chart calls for in the vast majority of literature, and I presume it's what the vast majority of teams use. We would not accept anything else. Story point burndown is for the release burndown chart, not the sprint burndown chart.
If, of course, the rapid board gets the expected hours burndown capability, and then a new dashboard gadget follows that, then voila, we've probably got a perfectly workable solution and happy-go-lucky users.
I'm all for moving forward with the rapid board when it's ready. But I tried playing with the scrum rapid board, and, as of 5mar12, I got stuck pretty quickly on what appears to be unfinished functionality that sent me crying to support.
I also agree that the priority of this issue is too low. We want our burndown chart posted on a wallboard display in the office, but not in its current form. Most scrum literature calls for "information radiators" to be posted pretty much everywhere possible, with the sprint burndown chart usually being the first such "information radiator" mentioned.
I am resolving this issue as completed, as we have implemented real time burndown charts in the new Agile boards.
We will not be improving the Classic burndown charts to also be real time.
Regards,
JIRA Agile Team