Meh, this doesn't change much.
As it stood, without Rondo, there was no chance we were making the Finals. Sure, we might still be able to make some noise, and knock off a team or two, but Garnett being out for a couple weeks doesn't change that.
Now, if he's done for the year, then yeah, there will be no advancing past the 1st round. I'm just not in any position to make such a claim. There's no way of knowing the extent of KG's injury, as this team has never really been very forthcoming with this type of information.
For all I know, this could just be a precautionary measure. It might very well be a case of Danny/Doc figuring there is little chance, at this point, of increasing our playoff seeding. So, by that line of thinking, what would be the point of continuing to play KG for the time being. Resting him for the playoffs would be the better choice.
Ultimately, I'm just not going to get worked up over this, as there is a lot that remains to be seen.