*based off of asking prices on fauna*
Sept 2009: killer bees $2k
Now: killer bees <$1k
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Now: killer clowns $15k
Later?: killer clowns $?
Fill in the ?s. As long as price is driven most by what is new and how 'available' it is, then yes, prices will always drop as people continue to breed. Because this hobby is entirely built around selling reproduce-able genetics to those who are going to breed, supply of any given identifiable and desired characteristic will increase.
Luckily there are so many base morphs in ball pythons, that the combinations are endless. It's going to take decades and tons of work to make that 25 trait animal.
Don't get discouraged however. In the coming decade, we're going to see individual ball pythons' perceived value be more determined by OVERALL look than any particular identifiable genetic characteristics. That high quality super reduced pattern killer clown may very well be valued more than the low quality lesser-killer clown with a less-desired busy pattern.
It's not about how the offspring you produce today *would* be valued if they were produced 5 years from now. It's about how the offspring you produce today will help you produce EVEN MORE AWESOME offspring tomorrow.