Some to take better jobs, some to take a slight upgrade and some taking a lateral.
Alabama is losing it’s usual ton of elite players to the NFL or to transfer.
Alabama will probably be rated in the polls number 2 for opening week 2019 and will probably make the playoffs again.
Notre Dame is not now, nor will be in the foreseeable future) equal to Alabama in terms of overall coaching and talent year after year.
I actually wish ND had played Alabama in the first round this year- they may have won. Notre Dame can still be a perennial top 10 team making the playoffs sometimes. “It is what it is”.