1) Why is film still being used - what are advantages at this time?
The biggest advantage, for me, is cost. I don't have a DSLR or CCD, but do have a film SLR and lenses, so right off the bat, that's hundreds of dollars (at least) that I don't have to spend. I crunched the numbers a couple of years ago and found that once I've shot something like 30-40 rolls (600-800 exposures), I'll have spent as much on film and processing as a used DSLR and will be much better at the actual skills and techniques required to get quality images. There's also an advantage to not being dependent on too much stuff. My SLR is purely mechanical and I guide manually, so there's no laptop, no autoguider, no worries about batteries dying and losing data, etc.
2) Does anyone in this forum still use Schmidt camera's
Well, it's now 2013 there are still plenty of labs, 1-hour photo places around, and equipment to develop at home is still pretty easy to get, so I think the answer is no.
3) Is it going to become totaly impossible in a few years get film developed?