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Its speculation. To "prove" that all DNA has a purpose, you'd have to show what proteins are encoded by for every single base pair. Or show that they did something else, like the preservation of the ends of the chromosomes for reproduction.

While the automatoin of the reading of the human genome went faster than anyone thought, automating the process of decoding an entire organisms genome is a vastly larger and more complicated project. I'm thinking this an application for these new biological computers. What a mess to set up though. I don't see how this can happen in my lifetime.

Its speculation.

No it is not speculation. Speculation is the assertion of evolutionists that all that DNA was total junk. That was total speculation based solely on the needs of their theory and having nothing to do with any scientific facts or experiments. What has been proven is that the DNA which evolutionists call junk does indeed have purpose and because all of it has not been deciphered does not mean that the rest is junk. It is up to evolutionists to prove that the rest is junk now.

Here are some of the things the "junk dna" has been proven to do:
non-coding DNA regulate translation of proteins.
non-coding DNA as silencers for suppression of transcription of proximal genes
non-coding DNA as enhancers for transcription of proximal genes.
noncoding DNA plays a vital role in the regulation of gene expression during development

The above from: http://www.psrast.org/junkdna.htm

Its speculation. To "prove" that all DNA has a purpose,

That junk DNA is not junk is not speculation at all. This has been proven. The speculation came from the evolutionists who were looking for a way to make their theory believable. Here's proof that although we may not know what it does, fooling around with "junk DNA" is as dangerous to the organism as fooling around with genetic DNA:

Sidransky and his colleagues set out to develop a better technique based on changes in junk DNA--genetic material that doesn't appear to encode proteins. The team found that repeating sequences of bases, called microsatellites, mutate when the bladder cells become cancerous, omitting or adding sequences. Comparing junk DNA in bladder cells and normal cells of 21 patients who had been treated for bladder cancer, the researchers were able to diagnose a recurrence of the tumor in 10 of 11 patients--as well as to issue a clean bill of health to 10 patients.
From: Junk DNA Tips off Tumor Comeback