It's getting ridiculous. If it weren't for the OKC's sucktitude and Toronto's rise, it would be even worse.
https://grantland.com/the-triangle/searching-for-balance-the-nbas-lopsided-conference-problem/
There are some suggestions to fix it, such as Cuban's team shifting between the conferences or OKC's unofficial proposal that suggests a non-conference top-16 playoff structure over the last six months of the season. I ask why not just combine the conferences whole together as the article below suggests as well. I don't know much about the practical obstacles to do it to be honest, but I believe that it would be much more fair at the very least.
https://www.sbnation.com/nba/2014/11/24/7274911/nba-conference-record-standings-imbalance
https://grantland.com/the-triangle/searching-for-balance-the-nbas-lopsided-conference-problem/

There are some suggestions to fix it, such as Cuban's team shifting between the conferences or OKC's unofficial proposal that suggests a non-conference top-16 playoff structure over the last six months of the season. I ask why not just combine the conferences whole together as the article below suggests as well. I don't know much about the practical obstacles to do it to be honest, but I believe that it would be much more fair at the very least.
https://www.sbnation.com/nba/2014/11/24/7274911/nba-conference-record-standings-imbalance