List of albums that will still be popular 50 years from now...

Ohio Express  Yummy Yummy Yummy (I Have Love In My Tumy) BDS 5018  Buddah Records
McCoys, The Hang On Sloopy BLP-212 Bang Records Mono
Archies, The The Archies, Sugar Sugar  Q16002 51 West, Stereo
Starland Vocal Band   Afternoon Delight  BHL-1-1351  Windsong
Reddy, Helen I am Woman ST-11068 Capitol 
Best Of The Vapors  Turning Japanese  EMI  B0000074RG
A Flock of Segals Listen JL8-8013 Arista
KC and the Sunshine Band  Everybody Get Down Tonight  DXL1-4010 
RCA
Bent Fabric And His Piano Alley Cat 33-148 Atco
Freddie & The Dreamers Hey (Do The) Freddie MG21017 Mercury Mono
Goldsboro, Bobby Honey UAS6642 UA Records Stereo
O'Kaysions Girl Watcher ABCS-664 ABC Stereo
Kenny G  Duotones
King Missile  Happy Hour  Detachable Penis  Atlantic  7 82459-2
Grease  John Travolta  Olivia Newton John  Polydor  825 095-2
DEVO  Are We Not Men  BSK 3239  Warner Bros. Records
 

@  rja.  So do I.
The first Chipmunk LP (1959) remains a collector item, and continues to increase in value. The Chipmunks are depicted on the cover as drawn images of Chipmunks, instead of the widely known cartoon characters.
From 1959 to 1961 (first 3 LP's) were depicted as actual images of chipmunks.  
David Seville And The Chipmunks - Let's All Sing With The Chipmunks ‎(LP, Album, Mono, Red) Liberty LRP 3132 1959
Will people still be collecting it in 50 years or listening to it in 50 years, remains to be seen/heard. Most of the people I have played it to really enjoyed it; in fact I have actually seen it bring tears to the eyes of a few. I think it takes them back to a happy time (childhood)