Do you think BGP for IPv6 will be more universally deployed than with our current IPv4 even in small businesses and homes? I guess I could try and get a 'shiny' new BGP AS but I'm worried the registrar only gives that to ISP's and large enterprises!
No, I don't expect residential to ever use BGP considering the cost of membership, annual fees, etc. Small businesses are a maybe, and only really if they opt for multi-homing at the office, or in colo/IXes.
Also it isn't a registrar that allocates ASNs, it is the RIR, and the same folk that hand out IPv6 allocations. If a small business that wanted to be multi-homed with IPv6 wanted, they'd get membership with their RIR, apply for the ASN and IPv6 space. If all goes according to plan, they get both the ASN and IPv6 allocation and have their upstreams speak BGP with them and accept their announcement of the allocation.