There's no such thing, IMHO. More choice is better, so long as the consumer is willing to do their homework before purchasing. I am sorry, this is how technology works, there IS no "too often, too early" so long as the device is ready to go to market. This whole expectation of Motorola to slow down their releases (which is NO quicker than any other manufacturer, IMHO) is frankly stupid, as it deviates from the way business works.
EDIT: Since each Motorola device is VZWs lineup right at this moment is aimed at a different market segment, there is no way that they are releasing devices too quickly. Right now, there is no overlap at all.
What he said......