Re:
The good ones will get cheaper, it just has to do with how many they are making. I don't see any reason why a fat bike should be much more expensive than a regular hardtail, other than development costs of parts and bikes as they are relatively new and that they are made in small numbers at the moment.
Thing is, the big boys are on this now (Specialized, Trek, Scott) and a ton of smaller companies. OK, none of them are producing many fat bikes but they are selling out, so demand is there. Rock Shox have done a fork - it's not very good but it's out there. SRAM do cranks - maybe OE only though? Schwalbe and Panaracer are making tyres. It is becoming less specialist and people on fat bikes are a more common sight than they were last year.
As for standards, that's bike industry. They never settle on anything for very long anymore.