There's room for both, a Sleepy Hollow attraction, and your Fantasyland expansion (Tangled/Frozen/Pinocchio? - could connect to Storybook Circus and give your expansion some boy appeal)
Combining the space behind Frontierland/Liberty Square/Small World & Mermaid.... it's huge - enough room for 7 to 8 attractions easily. If you remove the fancy new parking lot and retention pond, of course
Removing the Speedway and Barnstormer opens up even more room for Fantasyland and Tomorrowland (lots of green space behind them) to grow.
Adventureland is land-locked unless you shift Jungle Cruise and rework the area behind POTC (nothing impossible, but it wouldn't exactly be cheap)... you could fit Fire Mountain and either bring Indy over or build an Aladdin E-ticket (finally give TDO a good reason to move the Magic Carpets out of the marketplace)
Some backstage space/utilidors might have to be altered, but MK easily has the most room to grow out of any of the Disneyland-style parks.