Former Wimbledon champion Pat Cash believes that Novak Djokovic was right in forming the PTPA as the ATP is starting to lose their way recently.
Djokovic has been the only member of the big three that was at odds with the ATP and it was quite noticeably so. He talked about forming a separate body for a while with both Nadal and Federer siding with the ATP as they believed the sport needs to stay united. There are plenty of players that are not thinking that way and many top players even back Djokovic's initiative.
Pat Cash agrees with the initiative as well:
"I think the ATP and WTA are losing their way in some of these things. We need a player's union. There's no doubt. Always has been. Our voice is being lost by tournament directors. Not lost, but it certainly can be overshadowed by tournament directors who obviously need to make a living but they are promoters.
They promote a tour. Instead, they [ATP] are coming cap in hand to the promoters. They are promoters and not tournament directors, they're tournament promoters."
Cash added:
"The ATP needs to grow some cojones and they need to have a player's union and Novak is a 100% right and all other players are 100% behind him and they need to have their own voice."