The organizational weakness at catcher is a pretty important consideration. As I've said before to me he looks like a backup catcher in the majors. That has value. And players surprise to upside and downside all the time. So I would keep him but as the #2 catcher. If he beats out the #1 that's great. But we need to pick a solid #1. Doesn't have to be an All-Star who commands big bucks. I'm perfectly fine with someone who is solid defensively and will not hurt the team batting 7th or 8th.
Yeah. Over the past couple of years, given the general lack of real progress he's demonstrated in the Minor Leagues, I've come to the belief that Bethancourt's ceiling is more that of a defensive whiz than a serviceable all-around talent (a la Henry Blanco as opposed to any of the lesser members of the Molina clan). If the offense comes, consider it a bonus, otherwise just be content with the glove. A perfectly adequate #2 option, as you say.
McCann is an intriguing name to consider as an option for the #1 role. If the Yankees do indeed pursue Wieters (as it has been suggested for several years) then the Braves are in a unique position, both in terms of financial flexibility and available prospect talent, to pursue a trade for McCann and give him a few years at the position while they grow out their catching depth. Under such a scenario, Bethancourt would represent an almost idyllic back-up option -- ostensibly better defensively, cost-controlled.
Aside from Atlanta going after Wieters themselves, I'm not sure what other options are available to give the Braves a legitimate #1 option in the short-term.