One set per 4 months would be a better compromise, in my opinion. For all those who might get a bit bored in month 4, there will be some players who will find it a bit more affordable to stay involved with MTG per set and make time to take part in limited. Month 4 is probably when the next set is being previewed anyway.
Once you step out of standard, surely a lot of very broken decks are possible? As a new player who just wanted to make use of my rotated Dark Ascension, I would get stomped, wouldn't I? This does kind of prove the point of the need for rotation, but if there were 2 sets a year then each set could be in standard for up to 4 years. If that were the case, I'd still be buying MTG now, and I would have worked towards a playset of each set because I'd have six months to do so and I'd know I could get more value from it.
I'm not sure what the right rate of expansions for SE is going to be in the future, but I'd hope the wait for each set would be more like 6-9 months. And maybe we would go back to releasing parts of a larger set at shorter intervals instead of a very long wait. We've learned a lot from how things have gone over the past three years, so we'll let that guide our decision!
Cheers!
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