Despite all the explanations, moving the majority of BLs to UU is ridiculous. The majority of my Pokemon come from the BL tier, and I still hold my own very well (and win) with them.
Do you really think Pokemon like Staraptor, Alakazam, and Typhlosion would fit in equally with the UU metagame? Them, along with others would completely imbalance it. Which I guess puts me in accordance with what Luphrous said.
I love this game as much as the next person, but also like Luphrous said, I think we're just trying to fix what isn't broken. I'm not against moving a few Pokemon up or down the ladder, but to revolutionize an entire tier is drastic and unnecessary.
Rayfordjames:
Sure it will suck when some people use teams of only the best BLs, but it is no different then in OU when people use that same small group of dominating pokemon.
You're forgetting a big reason as to why people play UU in the first place:
To get away from the monotony of OU. OU consists of a lot of get in, sweep, and get out. While that may be true for some UUs to an extent, you can't say that UU functions exactly like OU, just with lesser capabilities.
Again, I don't think any tier is corrupted enough to be so drastic over it, but that may be just me.