From an ol' fart, who was around when '2112' was released during my high school years (and saw them perform it on stage):
2112 was half an album. Simply 'Side A' of a vinyl release. It was good to OK, a fantastic opener, fantastic finish, lame in between.
'The Astonishing' surpassed it ten fold. Yes, TA is too long. Yes, the story is similar. And yet, it is not.
Enough is enough.
Not sure of what has been released this decade that is similar. It doesn't matter. TA is a very good, ....no....almost a great album, that us old rock 'n rollers like better than ToT and Systematic Chaos and Black Clouds.....because it 'IS' music. Then again, I wouldn't mind if a track or theme similar to 'As I Am' or 'In The Name Of God' had been part of the musical story.