TL;DR Skip to the proposal
I worked in a small business out of college. Digital platform, subscription-based service. Two man dev team (later increased to three).
I was in the meetings; I was friends with the department head and the dev outside of work. I understand what it's like to develop software from behind the 8 ball in a tiny company.
I understand how hard it is to build a major software revision while working on the minor tweaks and features that keep your existing customers paying.

That said, everyone who reads the forum or spends enough time in Haven has noticed that SK is slowly hemmoraging players ("I'm quitting until the update!"). The animosity in the player base has become highly toxic *cough-Petater-cough* and contaigous. If you hear something often enough....

Sad reality of small business: the more your customer base shrinks... the harder it is to afford the staff that would allow you to release a major update.
 
 
WHAT I PROPOSE:__________________________________________________________
Back in the day SK players complained, "There isn't enough content! We want more things to happen!"
OOO responded by mixing up regular content events with costume events--at a 1:1 or 1:2 ratio--each right on the heels of the other. Pretty good! Keeps the game from getting stale, keeps people playing and spending $ and CE. Good business plan.

Today SK players complain, "GU! Arcade Redux! T3 boss! T4 boss! Any of the above! All of the above! Now!"

But it's hard! OOO, I *know* it's hard. So let's compromise? If you follow these steps not only will the players back you, you will neutralize a lot of the poisonous sentiment.
1. Change the update schedule.
   Instead of "2 weeks content -- 2 weeks costume -- 2 weeks costume -- repeat" do "2 weeks content -- one week off -- 2 weeks costume -- one week off -- back to content". A net gain of two weeks dev time per cycle, and we still get regular updates!
2. Reuse old content updates!
   You have a stack of events in the bag already. Danger (with all 4 danger missions available daily like the first time), Anniversary, Torto, Apoc, Kats, Hallow, Winter. Release one of these as-is without new gear/prizes, then make up for it with two new costume events each on the heels of the other. Still a net gain of two weeks dev time.
   Mix in some super simple new events: a Blast Network event--double the payouts and double the chances of getting a mask or prizes. Just needs tweaks to the prize table. LD with random prizes for participation--sky's the limit: boxes, 4* gear, rads, whatever. Just needs tweaks to the prize table. SLs 1 in 10 chance of showing up at D23 and one of the elevators is unlocked and free.
   Simple stuff without new costumes or gear. Gives you more breathing room.
3. COMMUNICATE THE CHANGE TO THE PLAYERS AND KEEP THEM INFORMED.
   This is the most important of all steps. It is *crucial* to the plan.
   If you let the players know WHAT you are doing and WHY you are doing it, they will applaud. They will cheer. They will understand.
   Once a month let them know that you haven't forgotten and you are still working on it.
   Maybe at the end of an event post in the Announcements you could drop a tidbit here and there. "PS:Gilded Griffin is devilish fun!" "PS:Hmm... had an arcade idea. We thought it would be really fun! ...on second thought, you guys would hate it. :( " "Hey, we're rereleasing this old content update for those of you who missed it: but don't worry, we'll have two back-to-back costume updates next! Here's a little pic to give you a taste! :)"

OOO, I know you probably have a million good ideas you want to do. You want to do Equinox/Solstice/Node/Mecha/Gremlin costumes with new models or new textures. You want us to have fun playing in the world you built.
But what we really need? As a playing and paying community? We need the big update that Nick promised us--that in retrospect Nick shouldn't have promised us (unmanageable expectations). The game I love playing won't survive without it.
Take the time to make it happen.

--Cheshireccat