Okay, now I understand what you meant.
My take, re-evaluated:
If they're spending capital to do a partial demo, they plan on spending capital on structure later.
If they spend capital on demo and structure, it's not simply going to be for more convention space, although this is needed.
Think back when they drained and filled the 2kLutS Lagoon. FLE did not follow right away, nor was it announced (or even planned) until some time later. An attraction was secretly in the planning stages then (Bald Mountain) for the newly reclaimed land. Bald Mountain was cancelled, but that doesn't really matter because an attraction was eventually built there (FLE).
Immediately after the lagoon became reclaimed land, the lot became Ariel's Grotto - a meet and greet that the Magic Kingdom desperately needed. It was added as a temporary fill until Bald Mountain was ready to begin construction (and later until FLE construction began).
Think of the demo work as paralleling the 2KLUtS Lagoon draining work. Think of the subsequent WoL structural work paralleling the 2kLUtS Lagoon landfill work. Think of an announcement of additional convention space at that parcel paralleling the announcement of the Ariel meet and greet for the 2tLUtS Lagoon parcel.
A future attraction on the WoL parcel could then extend from whatever work they are planning in the immediate future. The new structure would be designed to incorporated such expansion.
Just like all the steps that preceded FLE, any work planned for the WoL parcel in the immediate future is but a step towards an eventual big budget attraction there.