Maybe they'll move the Slinky kiddie coaster over from TSl, put a spaceship looking coaster car on it's track, and replace one of the two SWL attractions. Kills two birds with one stone cost cutting solution.
Seriously though, they may not cut already budgeted dollars, but once the costs start skyrocketing over the original budget, which routinely happens at WDW, then those details and non essential buildings that make the difference between a great land and a good land, may start disappearing, one at a time. Things like live character SWL streetmosphere, the marketplace (as you said), and general theming. My bet is it will happen, in a negative way.