Why all the conspiracy theories about dropping the Mark I & II support?
There's no evidence to suggest that anywhere. In fact there's plenty of evidence to suggest the opposite. Number one, Cliff himself has said otherwise, many, many times. Number two, from a development standpoint, there's no good reason to, since the firmware for the Mark's and the XL's are basically the same, save some very minor differences, as stated by Cliff. Number three, three, from the introduction of the Ultra, both the Standard, and Ultra had parallel development and ending cycles.
So what makes anyone think that Cliff would change that now?