I don't think that cards should get an errata just because they allow loopholes in certain decks. As mentioned, Zigil Miner and Master of Lore are bad examples of using errata. Best thing is to ignore these cards or certain combos, if you think they're overpowered.
I agree... do not like the idea of making more coasters just because there are crazy combo's out there that a few people play (or create to merely see if they can)... its a solo or Co-Op game, play it your way... if you like 1 round games... great... I think I'd find that a bit boring...