Is it going to be the case that record time runs will require certain class compositions? I cannot possibly imagine it was intended for the currently miles-ahead-combination of DK healing and DPS off-healing to function as ridiculously well as it is, and as a result the long term records for gold medals will simply never be overtaken if changes are made to essentially enforce a healer requirement (as all other tanks have). Within the following weeks, there is absolutely no doubt that every record will be held by a party that involves a blood DK and atleast one, if not both, of an elemental shaman and a shadow priest (or, indeed, multiple elemental shamans and shadow priests).
However, the only way to overcome that issue would be to wipe current records, which I cannot imagine would go over well with those holding it.
What is the design paradigm that will be guiding this situation?