The United States has a long history of making sure people pay taxes in the US Dollar. So, Bitcoin tax predictions? Better self hosted software will be developed that help people calculate the appropriate amount of taxes to be paid. People will likely buy dollars at the time of purchase of some other good or service to ensure taxes are good to go.

Bitcoin credit loans? If you mean mortgaging your Bitcoin, not owing Bitcoin, but rather owing dollars to pay off debt to get your Bitcoin back, companies will screw this one up, and some regulation will either restrict or ban it and quite frankly that's not so bad.

Domestic and international regulations? I have observed, that unless you're a global super power, you follow the laws of one of three global super powers. The US ignores Australian and European law, but those countries respect US law with great gravity for example.