It sounds like those aspects would be great additions to Crazy Taxi proper! It's just too bad that with mobile it's always an either/or situation. You get some cool new aspects, and you completely throw away all the established stuff that's taken decades to develop in the process.
Because they are to play...mobile-ly..
It would be awesome to have Crazy Taxi 4 with all those additions. But truth is that these games don't sell on consoles. Sega would be better off just making more Phantasy Star or Yakuza on consoles, and leave these experiences where people enjoy them, mobiles and arcades.
(I would argue they should all come out on PC anyway tho)
It's a transitional phase.