Am I crazy to think that MSEP may find it's way back to MK/WDW? Why would they devote the expense to refresh all the floats if they were planning on just using the parade for 6 months and then retiring it. Paint the Night is down for a lengthy modification. (Some indication that CMs were getting injured from some of the positioning on the floats.) However, PTN is supposed to be back by this summer. DLR has no need for two parades.
If they bring MSEP back to WDW...they get to sell it as "back by popular demand!" You get people more excited by taking something away and then returning it than by just keeping it there all along. (Sadly, humans will fall for this as something to be excited about.) WDW saves expenses for a year, DLR gets a temporary parade while PTN is down, and everyone wins.