I do hope this doesn't happen on a large scale (and if largish states like NC do it, the trend might catch on elsewhere eventually)...It's bad enough that gerrymandering affects the House, I'd rather not have it affect the Presidency...
I agree. I really like this method in theory but in practice it is prone to manipulation due to gerrymandering. It works best in smaller states like Maine and Nebraska because it is hard to gerrymander when you don't have very many districts.
I'd prefer the larger states (10 EVs or more) to adopt the proportional method.