Memchunkhax 2 seems to promise ARM11 kernel on all firmwares, O3DS and N3DS alike.Seeing as SNS seems to be quite confidently a New 3DS only thing, I don't really see any reason why I should update my old 3DS to 10.3. That way I can get Browserhax back. And I really don't want to wait for a 10.4 to suddenly appear that fixes the stuff they've now made ridiculously public.
It's all a matter of seeing where it goes.