Prices out of PHL for MCO are rising again for the end of August, which is when I will be traveling. Looks like all of the non-stops on SWA for my return date have hit the $115 pp mark. There are still a few 1-stops that are $89 pp.
I'm getting the impression that if the OP is planning to travel to Orlando out of Philly this summer or fall, they will need to pull the trigger soon. I don't foresee the prices coming down from $89.
JMHO based on a number of years watching airfares between those two cities.