ArxThe best thing Valve could do is try to retain a loyal fan base as cheaply as possible, wait to see how OverWatch works out (it will have heavy Blizzard investment) and if it turns out to be slightly successful, they could work on a TF3 game to compete alongside it like DotA does with League of Legends.
So, your strategy is to first cut costs in a market where service is valued at a premium. Then, you allow potential competitors time to outmaneuver you and claim market share you gave up on. Then, if they succeed, you start moving into a now more crowded market with harsher competition.
This is amazing to me
Real talk though pretty much all of Valve's decisions are based on a principle of "creating value". They don't aim to create cost efficiency across the board, they first aim to create the highest possible value from any situation, which generally works out being more cost efficient anyway. They hire the best possible staff and pay a premium for them, because one exceptional coder does more work, better work, and is cheaper than 10 average ones. This principle applies across the board. (Netflix does this too.) It makes the most sense to find what makes our weird tiny community so stupidly passionate about 6v6, and find a way to expand that to the masses. That's how you get your precious cost efficiency, by creating massive amounts of value.
Remember, before LoL and Dota went fucking bananas, little mobas that were mods of other games (starcraft, warcraft - note that Blizzard completely missed this train despite being on it from the start) had small, weird passionate communities. Riot and Valve either saw potential or got lucky in tapping into it, and here we are. 6v6 is a pseudomod of a worse game, and tapping into the weird little things that other people find and love is kind of what valve has staked most of its business on. (dota, portal, tf, csgo, l4d). We have consistently loved this weird little game of 6v6 for a long time. There's clearly some potential here. Valve sees this (now) and I guarantee you the conversation is "how can we create value here?" TF2 is and has always been in an awkward spot, but they're a company that likes to take risks and try things. Get excited.