Definitely missing some greats, but yeah, an era is certainly ending. I was a little worried there about 5 years ago, because players from the mid-00s hadn't really taken over the game in a way that was promising for the future. At least in a manner that would soften the blow from these mega-stars retiring.
Luckily '12 hit and baseball just got a historically great influx of young talent. Guys like Trout, Harper, Fernandez, the Mets staff, Bryant, Altuve, Betts, Stanton, Machado, Arenado, Lindor (and many more) have really gotten me excited for the future. Looks like we should have some really good star power at least for the next decade.