Toyota Repair: 2004 Toyota Sienna - 90K Service, crank shaft, timing belt replacement

Question
I have a 2004 Toyota Sienna with 90+K miles on it.  Toyota is recommending the 90K Service, which includes $1300 to replace the water pump, the crank shaft, and the timing belt.  Is it really necessary to proactively replace all of these parts?  I do understand the reasons for the timing belt replacement, but not the water pump and crank shaft.  All insight is appreciated.  Thanks

Answer
The timing belt is recommended at 90,000 miles, in my opinion it is a good idea to replace the water pump at the same time to avoid a failure in the future, I think you mean the crankshaft "seal" not the crankshaft, it also a good idea to replace the seals, including the camshaft seals, these may cause problems before the next timing belt replacement is required and if they start to leak or the water pump fails then everything has to be taken apart again at your expense,it's up to you whether to have the additional repairs done, if you plan on keeping the van for 30,000 miles more I would invest in  the additional recommendations.