honestly, i think one tire supplier would be better anyhow. I would prefer it be Michelin instead of Bridgestone, but either way I still think it should be only one manufacturer. A return to slicks wouldn't hurt, either.
The competition between tire manufacturers often hurts the competition on the track when there are huge disparities between the tires. it's one of the reasons the racing has been so dull in recent years. just my opinion, though.