There are bright sides of loot lockout. Say your first weekly run is ok and if you get a lockout all your subsequent runs you will be locked out of the loot whil estill providing you with ability to run the content. It seems very nice for many players but you have to look at it closely.

If it was possible there are so many downsides for the game:
1. Waaaay many people would have access to BiS loot. Be it weaker FC members pulled through content or rich buyers.
2. This would negate reasoning to run all other content for people who are geared (it is already a valid point for people who cleared coil)
3. This so much decreases lifetime for content. In a month or 2 max most of the server will be top geared whining that they are bored
4. Now if you look at player's gear you can judge upon his skill level. With locks removed everyone and his grandma will be geared and we will see a sea of poorly skilled players geared equally with top ones effectively negating that feeling of accomplishment for those skilled ones. The whole point of gear progression is that end feeling of superiority earned by hard work.
5. We currently have an issue of gil sellers being in demand cause you can buy T3 crafted gear and different kinds of runs with loot. Imagine what will be if you could buy endgame runs. We by our own hands will destroy economy allowing such heavy emission of gil into it cause SE won't have rights to ban us for doing paid runs legalizing this emission.

All this being said I can definitely ensure you - endgame content will have weekly lockouts for visiting forever. You can stop this useless whine now.