Sometimes I wonder if all the time they've taken between albums is devoted to making a sonic experience on the level of their past successes. If I think of it from that perspective, it makes complete sense why it takes them so long now. Must get harder as you age to achieve the levels they have. Thought fortunately for them, they're getting out of the mid life crisis zone of their forties which tends to trip most artists up.
Either way, if they are truly polishing up the hypothetical fifth album, I hope that it truly connects with the public the way they intended, rather than a TCH.