The costs of patent searches and the possible cost of litigation, whether the litigators claim is valid or not, are too high for all individuals and most businesses.
That should probably be "any individual".
In software writing, the introduction of patents would not just raise the barrier to entry, it would create a barrier where previously there was none.
I don't think you can get away with "software writing". It just sounds too artificial. How about: "For those writing software, the introduction..."
You could claim that Microsoft's threat is a bluff, using the reasoning you gave before (I missed it on the first reading of your last post). The main point is that it doesn't matter where R&D is performed with respect to these patents. Are we sure about the validity of the reports about the threat, though?
Good luck,
Malcohol.
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