No, the Blu-ray drive in the PS3 won't get worn out by playing BD movies. Games are much more stressfull than films for the reader.
I am under the impression that Blu-ray films require just a 1* reader, whereas the PS3's reader is a 2*. I could be talking out of my arse, but, that, to me, looks like the PS3 has an easy ride when reading BD movies.







