Albeit not being a perfect 3ed rule guru, I tend to agree with the core of the posters here.
The idea that ANYONE's magic would still work, even if lessened, in an antimagic area simply takes out, IMHO, the whole mean of "anti-magic" word,
It becomes, like you said, a "lessen magic" (or something of that extent).
Anti-magic has always been a powerful too at DM's disposal.
put a mage in an anti-magic zone, and he will sweat. A lot.
Now a mage is just cursing, saying "well, if things go wrong, my contingencies will still work" (hey, he could still teleport away, right ???). This would mean that some magic might be more useful than others in this new anti-magic concept.
I think I understand the goal you're trying to achieve.
I guess however, that anti-magic *should* stay "anti-magic* at non epic levels.
Some concepts have been proposed there, and I do understand them all.
Another would be to decide that *using magic in an anti-magic area, at epic levels, could be done, but it is tiresome*. Which means that the more you cast magic in an anti-magic area, the more it becomes difficult to overcome the full "anti-magic effect".
This basically means that magic users have to make a distinct effort to overcome anti-magic, and that this effort can be made only by epic level PCs.
How to implement this solution ? in any way you think of. It's the concept that I like, and it follows the line of thought that "antimagic is dangerous", and not "oh, ok, now all my spells are 50% less effective, well, who cares, I can deal with that since I *know* how they will work" (with the tiredness rule, which can be "increasing difficulty to overcome antimagic", you never know WHEN your spell will work.. or fail...).
Just trying to help, of course.
