Ok, just to make sure everyone's agreeing on several basic points:
- Most of people are unhappy with how magic works on EC
- Most of people are happy with how it works on BT and DWI
The rationale here is - some people enjoy magic in general, some people don't enjoy magic in general and some want to have experience of both magic-influenced and magic-free gameplay (like me for example). I believe it would be wise to meet the expectation of all those groups. Having two islands left as is (able to be heavily influenced by portal events etc.) and two whith magic/portal gameplay greatly reduced would provide some space for players of all tastes. Thus I believe Gabanus' idea from the OP is a good one.