I think it would improve overall gameplay (and also likely difficulty for the player) if the effect of Eyes of the Universe was cut back to, like a sensor ability bonus of 2 or 3. Then building it would certainly no more eliminate the need for the player to bother with sensors at all after that.

Also, I noticed that certain tech lines seem to be undervalued by the AI, like Sensor and Ethics line. This results in the human player always being able to get a lot of good trade goods and wonders, and that way handicaps the AI.
Suggested answer for that: There should no longer be a single AI value for specific tech, but an AI value for each individual AI. If such a thing were implemented, the techs researched by the computer would be more diverse. this would give the computer players a better shot at wonders, and result in more tech trading between the computer, making their overall tech level higher.