My youngest Granddaughter (9) sat in my car the other day, looked at the radio and said "What's that Poppy?" She meant the Compact Cassette sticking out of the front of the player! She'd never seen one in her life, and I must admit I'd never played one for several years. It's very similar to Antony's original question where he mentions floppy disc's. Floppy Disc's?

This "data storage" conundrum will only worsen in the future. Currently you store your photographs (possibly) in jpg (jpeg) format. This format uses algorithms to reduce data storage. However, with larger hard drives, broadband connections etc, do we need image compression?

So current/future formats aren't the big question, but backward compatibility.