I understand the reason for it crawling along (considering all the other construction happening all over the park (including in Epcot itself), but I think that pretty much means the "edutainment" concept could be finally seeing its final days in the next few years
My guess is they will go the same route the east side of the park --- and just ditch the educational aspects of the Land and the Sea. My guess is they would ditch Living with the Land and Nemo and put in more "exciting" attractions . and based on all the recent additions to Epcot -- my guess is they would be IP based.
Probably focus on the Sea first, my guess is that the LAND pavilion gets a lot of traffic with Soaring, the food court and the restaurant (with the boat ride an afterthought).
While the Sea was exciting to my son and Turtle Talk is pretty fun for the kids, I feel they "aquarium" aspect of the pavilion feels like an afterthought and needs a refresh. Frankly, it is not that big or educational compared to even small, local aquariums scattered around the country.