I'll have to remember the suggestions provided in these comments. As an up-and-coming engineer, I've been lucky enough to not experience this problem yet (everyone else makes the decisions for me), so this is good to know for the future. I knew reading Dilbert would be good for my career :)
I learned a long time ago not to ask an open ended question like that. Instead I tell them the plan and allow them to respond. If nobody steps up to revise the plan then the next thing that happens is that an email is sent to management (with CC for all the meeting attendees) stating that "We have agreed" followed by whatever my plan is.
That email is then used to beat up the non-perfoming meeting attendees when they don't adhere to the plan that they had the opportunity to disagree with, but didn't.
Lessee, deciding whether or not to make a decision about making a decision would require another protocol on decision making about making a decision. Aaaaagh! Thank God it's Friday....and I don't have to think about anything until my brain peels itself off of the ceiling. Watchword for the weekend is: "Civilization begins at noon"...that's my story and I'm sticking to it - at least that's what I've decided so far today...