The path to the olympics is open to anyone, from any organization.  the style of sparring in the olympics is set by the WTF, so there is no way for example to fight point style in the olympics, but it doesnt matter if you are a karate practitioner, if you want to, you can fight your way up to the Olympic Trials.

USA Taekwondo is responsible for choosing the US Team, they are appointed as the National governing body for Taekwondo in the US.  In order to compete at USAT events you have to:

1. Become a member of USAT ($35/annual)

2. Fight in a state or regional USAT event, place in the top 4

3. Attend nationals. fight in the "World Class" division. (only open to those that qualified at a state or regional event).

4. Place in the top 4 - attend various team trial events to make the US Team. 

National teams are selected only for 14 - 17 year old black belts and adult (senior) division.  No color belts, Ultra, or 13 and under teams at this time. 

As far as organizations coming together - It depends...the WTF is the sport organization for Olympic TKD - if they can grow, the sport grows, which is good for everyone.  But independent organizations will always exist.  IF you look at the history or TKD - its pretty obvious that people can't seem to get along, how many splits or organizations are out there...its as bad as religion! ;-) 

This is kind of unrelated but

If you remember the old site forums there were a lot of debates over which organization is better. But ultimately, every dojang has its strengths and weaknesses and in my opinion there needs to be better standardization of techniques and curiculum in all martial arts. TKD is lucky to only have relatively few organizations dictating what is TKD and what's not. If you look at Karate, there are way too many organizations fighting for supremecy.

So, one organization would be nice but that's politics for ya. We can't always agree on everthing.

The problem is that we look at karate the wrong way sometimes. Although it has the name somethingsomething 'karate', many have become very individual styles with different wys of addressing defense and attack. Just like wush/gung fu, there are many different styles, and a person in one could feel like they are learning a whole different way when trying another.

I think it's okay that it's not totally standardized between all tkd orgs.

I like standardization within an organization, because that means you can train almost anywhere, as long as they are ATA, or WTF, or whatever. I don't feel it is necessary between them though. I wouldn'y't want to be expected to teach like everyone else- not to say that I have any better approach. For example, I ike that I am not bound to only WTF sparring.

As for anyone going to Olympics...

In Manitoba, you can't just become a member of the regional WTF organization. You have to leave your school that is not registered with the provincial WTF org, and go to one that is if you want to compete at the regional competition. Then you go to Nationals, etc.

That's just the info that  got from the Grandmaster in charge in my province. I wanted to go to provincials, and I told him what school I was training at, and he said I should leave that school and go to a locally registered WTF school instead.

That was a bummer. Especially when I am Kukkiwon certified myself. Oh well.