I've been wanting 1.14.3 to come out no here but I can tell you from personal experience they will have to cut the numbers of players on all servers once that is done. While the client side of 1.14 seem okay in 1.13.2 the server requires a lot more horse power as is to run, especially with mods. While I really want some of the new features related to blocks and bamboo, it may not be worth the jump until some real performance gains are found.
I'm sure someone with the staff is watching the different plug ins needed but I'm not sure how much has been done as far as stress testing. I believe this will be huge to do before they do go live. I can't imagine blue with a max of half the players but that may be what happens. I have found for my own use, its just easier to run with the 1.14.3 client. I have a fair computer with a pretty good video card so that may make a bit of a difference.