<using the best 80's computerized voice>
Shall we play a game?
You can only pick 2 of the following statements in regards to the Lights, Motors, Action closure as being true:
a) It's being closed because it's expensive to run and WDW is aware that DHS is about to take a big multi-year attendance hit due to the massive amount of construction and closures (just like DCA did). The potential attendance hit is a big enough concern to take a closer look at the profit margins for the entire park.
b) It's being closed because construction is about to surround it on two sides and that section of the park is going to be potentially isolated until Phase 1 and 2 are finished and it's more convenient from a park operations perspective to just not worry about sending guests back to a long term dead end.
c) It's being closed because something has radically changed and Phase 3 of the DHS expansion has been accelerated (even though nobody is 100% sure what they want to put there) and Phase 3 will now start construction even before attractions that need to close for Phase 2 construction (SWL) have been announced they are closing.
I remember when 20k Under the Sea was announced it was closing for the upcoming New Fantasyland. It was so exciting that I could hardly sleep until it was finished.
As always with Disney Phases, don't bet your hard earned PowerBall winnings until at least there is dirt being moved around.
Phase 3 is likely going to happen; but, the timing of LMA closing now has very, very little to do with it.