I don't think any 'heritage acts' new music is going to be allowed to reach a younger/newer audience these days anyway as there aren't the channels open to them anymore to get their music expose to them in the same way (eg radio 1 air play, TOTP exposure etc).
I imagine a more commercial single maybe released to radio in Jan/Feb before the album which may gain more interest from older fans or people who like Mad World and may tempt them in to buying or streaming the album. Guess its all about ticket sales but i'm sure they hope the album sales and chart position are more positive than Everybody Loves a Happy Ending, otherwise it really would be depressing.
So your comment on heritage acts not being allowed to reach a younger/newer audience is a thought-provoking one. In fact, in an interview several years ago with the Guardian, Curt Smith said something along the lines of "making more music as Tears For Fears is a money-losing proposition" - and it was the exact reason that you mentioned - namely that music from legacy acts is dead on arrival. That being said, when this music is played alongside newer music by newer artists, it is fascinating to see the response. I manage an online radio station (that broadcasts globally) and am the playlist manager for it. The playlists are a juxtaposition of old and new as well as new music by legacy artists such as Tears For Fears - and the audience is as young as folks in their 20s up until those in their late 50s. It was quite interesting getting a reaction of younger listeners that gravitated to songs such as "I love you but I'm lost" by Tears for Fears and "Pressure Off" by Duran Duran - not realizing that these bands were still making music. The funniest message I got was from a listener in Scranton (Pennsylvania) saying she loved a new song called "Magnetized" by a "new band" called Johnny Hates Jazz. I think the medium matters. I don't see younger folks gravitating to a music video with aging dudes singing - but when you take the image out and just have the music featured alongside that of more familiar new artists, it is fascinating how people respond. That being said, while as a Tears For Fears fan, I like 'Tipping point", I don't see a younger listener with no concept of the band's legacy gravitating to this. This song benefits from the Tears For Fears halo and does not necessarily stand on its own. That works for me but is unlikely to work for a non-fan or casual fan.
From a chart perspective, I hope it does better than "Everybody loves a happy ending". That was actually quite a polarizing album. Besides "Secret world", I could not get into anything else from that album - and I am not one of those that cannot move past 80s Tears For Fears.