If it is possible to compare shutter life-span of DSLRs and film SLRs..... Not sure how long would it take the average casual photographer to reach 100k-300k shutter count, but my dad's trusty old consumer-range film SLR took 15 years before the shutter "lau-zhap" and died.
The main difference between film and digital photos is that it costs around $10 or so for 36 exposures - film and developing. It'll cost way over $20,000 for 100k exposures.
100 exposures per day, every day, for 3 years = 100k actuations. Not totally beyond the usage of a hobbyist. And there are nutcases who use the multiple frame per seconds of a DSLR to make movies... Some of the results look impressive, but, still, good grief!