The one format you hear next to nothing about these days is 'DX' namely 'APSC sensor DSLRs'. Now we know these are 'popular' but they actually account for 90% of total DSLR unit sales (according to Thom Hogan). And to see that these sales are alive and flourishing take a look at these sales figues that were issued at Photokina by Prophoto Online - Das Foto und Imaging Portal ... Obviously mirrorless is doing quite well but DSLR sales have risen by the same unit sales (and DX accounts for 90%). Mirrorless is not just M43 of course but includes NEX, Fuji, Samsung etc... In fact if you think about it those companies have made huge investment for relatively little return. Even amongst DSLRs Nikon and Canon are promoting the idea that DX is dead by pushing FX but DX seems to be doing pretty alright on its own. When I say all this is surprising - consider all the reasons that people choose NOT to have M43 or switch away from M43. It might be to go to NEX, to Fuji etc (both quite understandable) or it might be to switch to FX as size and price has come down but NEVER is it to switch to DX. Now personally I wouldnt pay much attention to this data apart from the fact that I was recently on holiday and I noticed everyones cameras. And everybody seemed to have a 'DX' camera (usually with a rubbish lens) and quite frankly I have no idea why.