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Except for people who want micropayments (and, um, that's what these appear to be, LOTS of them), I still have not seen ANY convincing arguments against the idea of raising minimums:
1) minimum BTC sent to, say, BTC0.001
and/or
2) minimum transaction fee to, say, BTC0.0002
I would rather have a robust BTC Ecosystem that gets my payments through in good time than worry about sending amounts of less than US$0.20.............
You really got no argument? Then how about that? Raising fees will simply mean spammers raise their fee too. Done. If the spammers are miner corporations then the cost would not be a big problem.
And no, it would be bad for adoption when we would make using bitcoin more expensive. Adoption is the only way for bitcoin to survive. Miners shouldn't shoot themselves in the knee.