What will collectors think in 100 years?

I just read NCS's article on conserving carbon spots.

http://www.ncscoin.com/news/enews/2010/April/article1.asp

Wow.

When is conserving conserving, and when is conserving cleaning?

The great thing about some coins that were cleaned 80 years ago is that they've had time and circumstances to tone again. But put a newly conserved coin into a slab, wait 80 years, and in 2090, they won't have changed a lick. What will collectors think then?

I suppose I might conserve some of my modern mint set, proof and commemorative coins, just to see how they grade out. There's still a risk, I suppose, of the "ghost" toning spots - or of NCS just deciding to delete all the tone entirely.

I love the toning especially on c. 1960 cello-encased nickels. That'd be a shame to lose.

The pictured 1962 Franklin would probably grade around PF 68 with no cameo, if carbon spots like on the left rim were removed. As a buyer, I don't care so much whether cleaned or not when it's just a $30-$50 coin.

But what if it graded PF 68 UC? PF 69 CA? Would you pay $300 for a coin that conservationists in 50 years might debunk as cleaned?

I'll be moving cautiously on my carbon spotted coins, of which I have maaaaaannnyyyyyy ...