So, I own an a5000. The video quality is good but like most mirrorless they lack a microphone jack. Only the high end ones have a mic input. However the low end ones come with a USB, ironically most DSLRs (even low end ones) come with a mic input. Syncing sound can be a drag. With USB you can do anything. Yes USB is primarily used for transferring files and powering devices but it has done much more due to computer software (video game controllers, video capture, sound recording, printing, etc.).
Solution: create a Micro (and/or) mini USB microphone or USB mic adapter for other mics to use on micless mirrorless. GoPro had a USB mic for their camera. The a6000 has a hot shoe and like a USB it can transfer power but can control devices like an external flash - even an external mic and automatically recognizes it. In order for the camera (a5000) to recognize the mic there probably should be a software update. Sony always finds a way. The a5000 should be convenient (after all I can hear the motor for the lens on video mode).