Mike Conley has struggled significantly to find his shot through 8 games of the 2015-16 season, particularly from beyond the arc. He's currently at 31.9% on 15 from 47 for three even with his hot shooting day (4/6) against Minnesota yesterday.
The addition of Mario Chalmers will likely play a role in Mike repeating performances like those. Having a balanced point guard to handle the ball allows Conley to use his speed to seek out shots without the burden of controlling the ball. This bodes very well for Memphis and Conley based on past stats.
For the 2014-15 season MC shot 39.1% on catch and shoot 3-pointers (2.2 attempts per game). That's better than Chandler Parson, Jimmy Butler and Kevin Durant. While Conley is only hitting 28% of them so far this season, the stats (and eyeball test) say it's worth continuing to let Mike roam and rove.
Having someone like Chalmers who plays fast and doesn't shot-hunt like Beno Udrih should give Conley a better chance at finding the same off-ball groove he had going last season.