I think they have saturated the event. davis cup is just too frequent.
I like the idea of having it every 2 years. that will allow the players to plan for it better.
or they can do it like the Olympics: 4 years.
every single year is too much. the sport has become too demanding for the top players to deal with it every year.
Every 4 years would be quite good as it will then some weight to it. Right now it just feels redundant.