I would never use the word "never" around Disney management...I think it's like saying "I double dog dare you..."
Disney has to weigh factors when it comes to closing things - costs for maintenance, cost for operations, crowd impact, popularity, etc. Sponsorship does a LOT to defray the costs and would of course shift the balance (and even perhaps come with a contractual obligation to keep it open...)
Wonders Of Life probably had several issues which brought about its close, and they just started with MetLife ending sponsorship. Although it had interesting attractions, there wasn't anything major compared to the more recent stuff. Most opinions I've seen between Body Wars and Star Tours - essentially the same ride mechanics - is that Star Tours was the better ride. That doesn't mean they weren't good attractions - but they didn't necessarily draw a lot of people.
It was also set back and obscured more than the other pavilions, perhaps contributing to a lack of notice and general traffic.
At some point the effectiveness of it as a pavilion to absorb guests is not worth the expense of operation.
I've got to imagine that maintenance costs of Test Track are MUCH higher than WOL - but Test Track absorbs guests.