I foresee "reasonable" public acceptance once service to MCO is establighed, but not enough to ensure Brightline is a going concern. Reports of the passenger counts - on the existing MIA-WPB service - that are part of the all too often grade X-ing collisions are "not very encouraging".
I further foresee a State "bail out" of the "well connected" bondholders who acquired these Federal income tax free Private Activity bonds with a reported coupon of 8% interest through a private placement, meaning what they actually paid for them is, well, "private". I fully expect there will be "an on the QT" bailout. Likely not for par, but enough to represent an effective interest rate well in excess of any available on the open market.
Brightline will then become a "ward of the State".
Oh; and willing to bet that these bondholders are Florida residents - no State income tax!!!! Further, when the State "bails 'em out" - there will in all likelihood be an eventually quite deductible Long-Term Capital Loss (a Net Capital Loss is either offset against present or future Capital Gains or deducted at $3000 per tax year until used up - the latter of course pocket money to these Bondholders).
Florida has shown they are quite pro-passenger rail (just so long as it isn't Amtrak) with the two regional passenger agencies (Tri and Sun). Adding an intercity agency would fall right in place.
BTW, I'm "going down" during January; I certainly plan to do a Miami-W Palm joyride allowing time for a nice Ribeye at a Ruth's Chris within walking distance of the WPB station. It will be most interesting to see if the high level of service I enjoyed on my Jan '20 joyride (as well as those during '18 and '19) will still be in place.