Well.. I don't think attacks themselves would ever reduce..
(But that's semantics).

What to do about those attacks.. First and foremost. Make
Windows more secure. Not just fill in the holes as people
find 3 more. Yes also try to make i.e. Vista less prone to
attacks on that front but also make it less vulnerable to a
"not-so-informed" user. People have been pleading
Microsoft for years to do something about their OS in i.e.
the area of the user having "super-user" priviledges all the
time.
Well .. Now they think they've solved it. They've added
the "authentication" in so-very-much-Microsoft-way.
Check out an InformationWeek review "Mac OS X Shines In
Comparison With Windows Vista": http://
www.informationweek.com/news/showArticle.jhtml?
articleID=196800670&pgno=4&queryText=

Don't get me wrong. I'd be very happy to see Windows get
better and I honestly hope it would. But it doesn't. Last
year I got tired of the bugs, crashes and security problems
and switched to a mac. No going back I say.

It was Microsoft's opportunity to prove the switchers
wrong and try and get them back but what did they do...
Pretty much keep on with the buggy swiss cheese they've
been promoting since 1994 or so.