Not every camera shoots DNG, only Leicas do at this time.
Not true I'm afraid... there is at least one other system with a dSLR that lets you choose between proprietary RAR or DNG... let's just say Benjikan quite likes them, now go on and take a guess
If you find Jpeg best for your workflow, if it fits your shooting style and you're entirely happy with the results, great. Personally I'm sticking with RAW for a number of reasons. It's nothing to do with being unhappy with how my camera processes Jpegs. It produces some very nice Jpegs, but I don't see why I should limit myself. With different processing or even using different software I have so much more control and flexibility with RAW. I'm not saying it's inherently better suited to professional purposes than Jpeg, but for me it is a much better format and I don't expect to suddenly find myself with a bunch of unreadable files any time soon.
P.s. you seem really certain film is dead... you should go tell Mr. Villa who just joined the forum