No, exFat is patent encumbered and isn't as simple and well documented as vfat (so non-Windows implementations are worse). vfat is still the common denominator.
exFAT suddenly dirty-dismounts both on windows and osx, and is hard to mount again for regular user. Tried it as common r/w storage for bootcamp -- complete trash, cannot be used for long-connected drives, hyperactive torrents, big files. Copying some files forth-back is okay though.
