I completed my PhD on kikuyu here in Australia last year. One of our aims was to collect naturalised ecotypes in the wild and hybridise them in an effort to produce some new sports turf lines which could be used for golf, rugby, public parks, etc.
As Tom Doak mentioned it really does bind together. Early researchers coined the term 'sod bound' for this. It normally happens when the grass is several seasons old. I saw the kikuyu first hand as well last year at Riviera, as well as recently at Torrey Pines, and it is exhibiting what Tom notes as lifting away from the soil. The poor root development was leading to a few disease areas at one of the clubs.
Sod farmers in Australia are countering the reduction in root mass over time by periodically spraying glyphosate in strips through their fields. This promotes new runners, and a new root system, which not only assists in harvesting, but also produces a more healthy plant.