Most bad cards don't get buffed, only good cards get nerfed.
Agreed- we can still ask though. The worst they can say is no. If the community all agrees it's a terrible card, why not fix it (or re-fix it).
Other priorities. I think they'd rather bring new product to market than put effort into rebalancing and playtesting product included in the original core set.
Bad cards can be altered with minor tweaks, but there is no way you can "fix" the gate without completely redesigning the card. At that point AW can probably better create a new card.
If they brought the casting cost down to 7 or 8 AND made it a quick-cast action (in line with the Totems), it might be worth playing. Then, the cost:benefit breaks down like this:
- 7 or 8 mana QC, targeting a zone at range 0-1: All demons (friendly and otherwise) get Melee +1.
- 12 mana and Full action, no range or LoS restriction: 4-dice Flame attack against all non-flying creatures in the Arena (friendly and unfriendly, including your mage), PLUS you turn the Gate into a "Garrison Post" for any future Demons you or your Pentagram summon.
This way, you at least get a "totem" for Demons at a reasonable cost even if you never "Open the Gate." ... Although I'm not sure it's worth 6 sbps... maybe 4?
*edit* By the way, here are the new (left) and old (right) versions of the card side-by-side (token in front of the wrong one; oops!)