Nope. Even if they don't make the deadline, it's been established that they don't need to 'worry'. Congress is currently reviewing their stragety submitted earlier this month, and will come up with a 'verdict' within weeks (presumably).
And the 'forced' bit in the news is misrepresented. If Congress does not believe GM can be viable -- which has nothing to do with the deadline -- they will demand repayment of the first round of loans immediatedly instead of two years from now.
That's what will force them into bankruptcy...thankfully...our gov't doesn't have the direct power to just point and say "bankrupt".