Depends on which segment of their business. Don't think it would effect cabs, but potentially losing their contract with Disney for DME (they would still have DCL) and the folks who use Mears to get to UNI would hurt their business in a big way.
Also, if you're going to reference Mear's support for SunRail, stop being so coy about it. Mear's bread and butter is the tourism segment which SunRail isn't really built for, at least for now.
Don't get me started about SunRail. Diesel locomotives and the system is 100% at grade. Not to mention the pricetag that is in the billions.
In South Florida (where I live), we have Tri-Rail. The trains run on diesel, but they just purchased new locomotives that are a form of hybrid-electric and run at a respectable savings on fuel. It is also at grade, but about half of the roads it crosses go over the tracks - and there are less crossings in general. SunRail has crossings at every block. Even with the limited number if crossings and the roads that go over the Tri-Rail track, the system has had many deadly accidents, where drivers think they could outrun the train.
The Orlando system will be a much deadlier mess. The crossings will only add to Orlando's traffic woes, rather than help it because traffic must stop where it didn't have to stop before. Steel on steel heavy rail is loud and unsightly. The many neighborhoods it will pass through will grow to hate it. In addition to the noise, they will have to deal with the dirty exhaust of diesel fuel.
Tri-Rail at least goes somewhere. It connects Palm Beach, Broward, and Dade counties and has a direct connection to Miami International Airport, as well as Miami's own Metrorail (electric elvated heavy rail), Metromover (elevated up-town /me downtown rubber tire automated people mover system with three different loops).
Sun Rail goes where? Not to Orlando international. Not to the Convention Center or I-Drive or Universal or any where worthy except downtown.
For the billions they are spending, they could have built an elevated light rail system on at least a portion of the planned route. When they realize they will need to spend billions more on safety improvements, it will actually cost more than had they done it right to begin with. And the fact that the system goes nowhere will result in low ridership, further adding to the system's real cost.
The only thing that will save it from being a total distaster will be the maglev, which is being planned to tie into it - and the All Aboard Florida train that will start service at around 2015 that will connect Orlando, West Palm Beach, Ft. Lauderdale, and Miami!