Matrix organization structures are usually introduced to break down the “silos” that stop people cooperating laterally across the organization. If they are successful then (unsurprisingly) what you get is more people cooperating across the business!
But be careful what you wish for.
If you find your “one team approach” (very popular at the moment) leads to lots of unnecessary teams and meetings and to everyone being involved in everything then you have gone too far. It is a very common symptom of matrix management problems and surprisingly hard to recover from.
Does it feel like this in your company – tell us how it looks in your company and we can suggest some solutions – we often save our clients a day per week of unnecessary cooperation.
Or listen to some suggestions on the AMA podcast I recorded last year on speeding up cooperation in complex matrix companies.