We can't afford to rely on any single source for upgrading the QB position (otherwise, quite possibly, guys of the caliber of Flacco or Rivers won't be available and we'll have boxed ourselves in (i.e. being forced to reach for an average QB in the draft, letting time become our enemy or being on the sucker's end of a bad trade.
We, therefore, must explore every avenue and be prepared to leap quickly should a really good opportunity develop - wherever it might come from.
Which is why we should keep Kolb around and add Hoyer to our stockpile of options.
One other indirect factor we fans should be cautious about - if we're too rough on ownership, individual players and the current regime, we might create a situation where FA's won't want to come here. (We can be critical, but we should be responsible in the way we say stuff).