I'd do it.
I think what this team needs is a Lonzo-like PG to really get the most out of our other guys (Tatum, Brown, maybe Fournier if he stays). They obviously aren't getting CP3 nor are they getting Rondo. There aren't too many PGs who are focused on facilitating nowadays but that's the kind of guy I think the C's need.
I'll miss Smart but I hate this notion that he's "untouchable". At some point this team's got to make some changes and it's not like you can just keep everybody. Otherwise, have fun basically running it back again.