I'm not saying that Beau Billingslea is a bad actor, and I liked him as Barret, but what I'm trying to say is that he might not return due to either being busy with another project in his voice acting career.
I'm glad Steve Burton is(or might at this stage) returning to his role as Cloud. I've heard a lot of actors enjoyed voicing certain characters, which though for some reason some of them are cut off the job because of company changing or forced voice changing, or them being unable to continue their favorite roles.
For example, Veronica Taylor, the voice actress of Cosmos in Dissidia Final Fantasy games(except for the new arcade one since Cosmos isn't in it), she was originally the voice of Ash Ketchum from the Pokemon anime up until the end of season 8 and she revealed she loved voicing Ash(and his mother Delia and May). It must've been so hard on her when she found out she was out of the job of voicing Ash who was replaced by Serah Sarcomony(or whatever her name is) since season 9 and is still going.
And Terri Hawkes who voiced Sailor Moon in most part of season 1 up until the end of the second season, where she left due to pregnacy. She also voiced Sailor Moon in all three SM films, and she liked doing Sailor Moon too.
Let's not forget Quinton Flynn, the voice of Reno(and Axel/Lea in KH). I hope, due to his love for voicing Reno, will return for the remake.
But you never know. Something might happen.