Serving MCO, MIA and TPA would allow TCX do sell more appealing fly drive and multiple stay packages which would make it easier for people to do say a week in Orlando/Tampa do do the theme parks followed my a week in Miami/the Everglades. If they ever add SFO or OAK they could do a similar thing for LAX/LAS/SFO.
I'm also interested to see how TCX develop their long haul routes from London with STN being thrown into the mix as well now.
Interesting times ahead it must be said.