It's your decision, however the fact that you're seeking advice suggests to me that you have doubts about this mileage jump.
100MPW sounds macho, it works for those with the physical capability to handle it as long that they have the time to do 'the other things' as mentioned on a previous post. (ice, stretching, weights or nautilus, massage etc.)
Stick with the known if you are that close to your goal race. I might suggest trying for a mileage buildup for the sake of experience with NO goal marathon sometime next year. Granted that sounds radical, however the experience gained may be worth it. You could aim for a distance SHORTER than 26.2 (half marathon to 30k) to assimilate and experience how your body reacts: day to day pains, do you get sick or easily injured when you go over 90MPW, can you handle any quality work during this time, when you run test races in your build up (if you choose to) do you feel extremely tired or do not perform well? et al.
As others have posted not everyone can handle 100MPW. You may have great success at 70-85MPW, if so there may be no need to go to that next mileage level right now.