If you had all the Modern Young collectors half dollars in there original holders, would you have them graded and slabed or would you leave them the way they are. What I'm really trying to say here, 50 years from now will they be worth more graded & slabed, or in there original cardboard containers? Just your opinion....
Sorry Ed, my crystal ball is broken, and my mind reading license has been revoked. BTW as a non-collector of US coins, I have no idea what a "Modern Young collectors half dollar" is.
Nobody knows the future, but it is possible that TPGs are a passing fad that will disappear in a couple of decades, or get replaced by some other form of grading, perhaps computer driven digital scanning/grading or something like that. Having a coin in the original Mint packaging seems like a more permanent collectible. I wouldn't get the coins slabbed.
If you''re planning on keeping them for a while, I would keep them in the original mint packaging. If the TPG's are still around in 50 years, and that's when you want to sell you could always slab them then if it's advantageous. If the TPG's aren't around in 50 years, I kind of doubt their hunk of plastic around the coin will command a large premium. No point in slabbing them now if in 50 years your just going to have to crack them out. Besides, the way I see it is that original sets like these are getting broken up all the time by people slabbing them or busting them up to put in an album or whatever. The number of original sets from the mint in the original packaging is only going to decline.