The team will be fine, Spoelstra will figure out how to utilize Rozier who I suspect will end up being the #1 option (maybe even in the playoffs) and with that, rebuild the lineup which may not change all that much to better use the main guys.
Butler is coasting, we all know it and it's frustrating as hell, if he's not giving good effort most of the season trying to preserve his body for the playoffs and maybe to extend his career. Let's not pretend that Butler isn't a mismatch unless he's working hard and using his strength, so it's almost all or nothing for him.
BTW... whoever is still bitching about Thibodeau and Butler's minutes, Hoiberg coached Butler after Thibodeau in Chicago for 2 years and after the FO bitched about Thibs and his minutes were more than fine watching Hoiberg play Butler 37 minutes a night both seasons under Hoiberg. Yes, Butler played big minutes but lots of players back then played a lot of minutes.
Herro... either he's going off ball more which will limit his game while it helps the offense or Spoelstra will move him to the 6th man and allow him to be the #1 option off the bench. Although I'm not a Herro fan, I can see putting him on the bench allows him to keep using all his skills and possibly give him a chance to keep expanding his game (but it may be the first step of him leaving Miami). Not only does Herro's ego not want to go to the bench long term (Rozier is here for 1+ more years) nor is Miami putting a 30 million dollar player as a 6th man a good value.
Bam's fine, I think Rozier will really help him, not only with pick and rolls but giving Bam a better chance of getting offensive rebounds from Rozier drives.
Then there's Jaquez Jr and he needs touches. If you started Rozier, Robinson, Butler, Highsmith and Bam you have 3 main options and 2 role-players (Highsmith defends the better guard, Robinson guards the weaker forward, Butler guards the better forward) then you can have come off the bench.... Herro, Richardson, Jaquez Jr, Martin and Love. I really like the 10-man roster, but you can see a consolidation could be done and with that and you have 2 guys who can step in a backup situation without missing much... Cain and Swider and you should be either upgrading another player or getting some assets back.