In the words of Barney Fife about trapped boxes.. "Let's nip it, nip it in the bud."
Seriously.. it will hurt mages, but it will also hurt dexers and other non-mages. Things will balance out eventually, just as the original change did. Don't think of your current template, think of why this skill is semi-meaningless and why it serves a better purpose to make skills worthwhile instead of sometimes-worthwhile.
I posted a similar thread on UHall and don't expect much sympathy, but I figure on Siege this might be able to get done.