I'm with you. To me, the extension to DS is much more important for people flying into MIA, FLL, or PBI. And down the road, for people flying into TPA.
Getting off a plane at MCO, collecting your luggage and taking the train to DS, and then having to get a ride somewhere else, is just wasted time IMHO -- unless someone just wants that experience.
I don't know about pricing, but I personally would pay more Mears Connect than I would for Brightline, and then still have to get a ride from DS to my resort. OTOH, if the guest were staying offsite, those time and math calculations would be different.