Bright line rail service once it happens can be quicker. The 417 toll road from MCO to WDW which is two lanes northbound and southbound can have car accidents that can close the roads and really snarl traffic to either you being late to start your vacation or late to catch and maybe miss your plane going home.Would Brightline be much quicker than a direct bus? I’ll admit I’m ignorant on the specifics but I suspect the comparison above isn’t all that relevant. I think WDW is closer to MCO than DLP is to CDG. And Paris is a major city with massive differences in traffic/congestion compared to central Florida. even if it’s faster, you have to deal with two different boarding/transferring luggage and depending on how the timing works out, you could get substantial time loss in the process due to that.
Taking too long never seemed like an issue for MDE to me. And it won’t be an issue on whatever Mears bus replacement will exist (or whatever company fills the vacuum) or just taking a towncar or Uber/Lyft/taxi. All those options would seem to fit WDWs core guests much better than Brightline will.