Yes I know the Craftsman's are newer, but at some point they will become collectable.
Collectable? Certainly, ... to a select few.
Some people collect beer bottle lids. Some collect paper clips.
Now wide-spread desirability among the average garden tractor collectors?
NO WAY. NEVER.
Not even 50 years from now because of how many thousands were made.
If I'm going to all the trouble to fix and paint up a garden tractor, I don't want to take it to a show where 45 others just like it are parked in the same line as mine.
The same thing happened to toy tractor collecting. Old stuff [1940's-1950's] is hot and desirable. In the 1980's, toy tractor collecting hit the main stream. Toy tractor models were so mass produced that they will never have the desirability and rareness of the older stuff.
A short supply creates demand.
Mass production, and shoddy construction leading to premature failure just causes bad memories.