Not necessarily true. It's still early in the process, but there's been rumblings for some time now that a spending floor be put in place before you can effectively put a cap in place. Assuming the momentum for a worldwide draft continues, it would also help make things for all teams more equitable by tying floors and ceilings to overall revenues as much as possible. Teams that ultimately benefit from the profits gained from the bigger markets could be required to spend at least a large percentage of profits gained from revenue sharing and the national TV/internet/etc. deals directly on player salaries to help make them more competitive.
The Braves' rumored $110 million payroll ceiling isn't in place by chance. The team received $110 million from its share of MLB Advanced Media revenues in 2013, meaning that all other revenues were available to Liberty for other concerns - including profit. If the next CBA required that each team invest its MLBAM share PLUS 25% of their own media rights in player payroll as a floor, that number would suddenly jump to $136 million since the Braves 2013 media rights were ~$103 million. Doing so would still have left the organization well in the black with an operating income of $15.4 million.
http://www.bloomberg.com/infographics/2013-10-23/mlb-team-values.html
http://www.forbes.com/teams/atlanta-braves/