I don't see what they have to gain by adopting an APS-C sensor. Full frame fair enough but even then there are sufficient full frame options already. Who is going to buy these hypothetical APS-C and Full Frame Olympus cameras? Nikon/Pentax/Canon/Sony users? why would they ditch their existing kit to switch to Olympus. Think Olympus E-System users would all want to switch format? it may not have occurred to you that people use the E-System because it suits their needs as is. I switched from APS-C Nikon to 4/3rds Olympus, if I was that desperate to own Full Frame or APS-C I'd switch to a brand that offered it, if the Olympus name was really important to me but I still wanted Full Frame I'd buy a D700 and paint Olympus on the Prism.