Water Pump Seizure in 2.8 V6 90CSQ

["Scott D. Keimig, Ph.D." <keimig@ibm.net>]

At about 65K miles the water pump seized in my 1993 90CSQ with the 2.8
V6.  In sequence the timing belt broke and my valve train turned to
toast.  This was the original water pump and timing belt - all service
work has been completed by authorized Audi dealerships and according to
the schedule in the owner's manual (I'm the original owner, and this is
my 4th Audi.)  

According to the Audi service reps, water pumps and belts are not
replaced according to any schedule but by appearance of belt wear or
development of coolant leaks (and my owner's manual seems to bear this
out) unlike other marques where these are replaced at between 50K - 75K
(and I recall my earlier Audi's having this as a service requirement.)
Since my belt was fine and I had no coolant leaks, my parts were never
changed out. So, by following the factory recommended servicing schedule
and having the work performed by Audi certified mechanics, I am rewarded
with a $2800 repair job!!

Any collected wisdom out there on this subject?  Are Audi water pumps
prone to breakage at 6 years/65K or are they expected to last
indefinitely? Shouldn't as a matter of course this service be completed
at the 60K service? Is any help available from AOA? TIA!