I'm sure I read on the T&C's, ah, yes...

6. Members who seek to make a Rewards Redemption with an insufficient point balance may make the Rewards Redemption and either (1) choose to purchase points to make a valid Rewards Redemption, provided that the aggregate amount of points purchased and received as a gift by the member is less than or equivalent to 50,000 points per calendar year; or (2) the member accrues sufficient points to use points for payment of the Rewards Redemption no less than seven days prior to arrival. If point purchase is not an option, or if member does not have sufficient points to use for a Rewards Redemption intended to be paid with points seven days or less from arrival date, member will forfeit any Rewards Redemption and must call 1800 MARRIOTT to re-book the reservation at the best available rate for which the member qualifies.

So, by the looks of that they'll cancel the reservation if they cant sweep it out your account 7 days before the stay. Against that, bonuses generally credit automatically on the day you qualify for them, but even so, that only happens once the hotel posts the points on Marriott.com, and that wont happen for a day or 2 after the stay.

All too late I think, but I'd have a word with MR eilte line, you never know they may be able to give you some leeway, after all they have access to your forthcoming reservations...