I don't know about the summer, but several times earlier this year we went to TLS after dinner at Garden Grill and before we wandered over to grab our spot for ToN and RoE. We were just about the only folks in there. I don't know that this reduction in hours will affect too many people.
And, I agree, the Living Seas needs some help. Without a sponsor, I can't imagine that it will get any, though. I would venture to guess that long before Wonders of Life would shut down, we would see the end of the Living Seas. Luckily, there has been no precedent of a FW pavillion closing with no plans for a replacement attraction. Not saying that it won't happen, it just hasn't happened yet.