I don't know about bringing Joe off the bench necessarily but if Exum can come back and stay healthy, get some form back and run the bench unit like he was December last year... a bench unit consisting of something like Exum/Royce/Ingles/Bojan/backup 5 or Gobert could absolutely destroy opposing bench units with Exum collapsing defenses to three great 3pt shooters, or getting it to the roll guy on the PnR.
edit: Plus because of Exum's size if he's having a good game Quin is no longer stuck with trying to run Rubio/Exum dog crap lineups and can instead play Conley/Mitchell/Exum lineups in place of Joe against small ball teams which is even more exciting. If Exum's playing like dog crap which he will for the first couple of months of the season coming off injury as is tradition at this point, you can potentially still have Neto running that bench unit with Joe taking more playmaking responsibilities