Even if somebody had a
great idea that would make things smaller without any other penalty,
which I'm not sure I believe either.
I'd say that the only things likely to bring an improvement significant
enough to warrant the (quite large) hassle of implementation would be :
- read-only / archive tables (get rid of row header overhead)
- in-page compression using per-column delta storage for instance (no
random access penalty, but hard to implement, maybe easier for read-only
tables)
- dumb LZO-style compression (license problems, needs parallel
decompressor, random access penalty, hard to implement too)
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