Barriers to communication are anything that stops a message being received and understood as intended, arising at the sender, the medium, the receiver and from 'noise'. A business can certainly reduce these barriers, but whether it can fully overcome them is far less certain.
The case that barriers can be largely overcome. Many barriers have clear, practical solutions. Unclear messages and jargon can be removed by training managers to use simple language; the wrong method can be replaced with an appropriate one; a long chain of command can be shortened by delayering; information overload can be cut by rationalising channels; lack of feedback can be fixed by building two-way communication; and language/cultural barriers can be reduced with translation, a common language and cultural-awareness training. With investment in training, structure and technology, a well-managed business can reduce its communication problems dramatically, so in that sense barriers are highly manageable.
The case that they can never be fully overcome. Some barriers are rooted in human nature and circumstances that cannot be eliminated. People will always have different perceptions, biases and moods; a demotivated or distracted receiver may misread even a perfect message. Cultural differences in a global firm run deep and change only slowly. As a business grows, communication inevitably becomes more complex, creating new barriers even as old ones are solved. Solutions also have costs and trade-offs β delayering widens spans of control; more channels risk overload β so 'fixing' one barrier can create another. And 'noise' of some kind is always present. Because the receiver is a human being whose interpretation cannot be controlled, perfect communication is unattainable.
Weighing it up (criterion). Whether barriers can be 'fully' overcome depends on the type of barrier and how we define success. Technical and structural barriers (channels, methods, chain length) can largely be engineered away. Human and cultural barriers (perception, bias, deep cultural difference) can be reduced but not eliminated. If 'overcome' means no barriers at all, that is impossible; if it means barriers reduced to a level where communication is reliably effective, that is achievable.
Judgement. A business can substantially overcome its communication barriers but never fully eliminate them. Structural and technical barriers can be largely removed through delayering, the right methods and clear channels; human and cultural barriers can be greatly reduced through training and good management, but never entirely, because communication depends on the perceptions of human receivers and on a changing environment. The most defensible conclusion is that overcoming barriers is a continuous management task, not a one-off achievement β the realistic goal is to reduce barriers enough for communication to be consistently effective, while accepting that some 'noise' will always remain, so the answer to 'to what extent' is to a large but never complete extent.