The problem is do you trust sony? Look at all the promises sony made about NEX. They promised more lenses but nex still suffers from lack of native lenses. Then Sony decided no more nex name. Everything is alpha. Now you have alpha bodies with A mount, E mount and FE mount. Sony keeps changing direction.
Actually, this might have been true a year ago, but Sony has released a lot of E-mount lenses for NEX and you can get just about anything you need. They are slightly bigger than M43 lenses, but are very light.