I thought the keyboard length was one of the most glaring shortcomings. This 49-note business is an unhealthy arrangement for serious keyboardists. It's a musical blight like mini-keys.
That depends a lot upon how you use your keyboard... 49 is the absolute minimum for me, but I can certainly live with it, even though I also prefer playing live... I think it has a lot to do with what genres you play, and what way you record. Playing a huge range makes the frequency spectrum you occupy a lot larger, allowing less space for other tracks to "!be there" as well.
I know that you record everything in one go, not doing "tracks" in that sense, so I can certainly understand your concern... but actualy, having 3 to 4 octaves can be an advantage, if you record in tracks because you will automatically be restricted to a certain part of the frequency spectrum for anything you play... play the lead in one track... shift a few octaves down, and then do the bass... etc. etc...
I often find that with a large amount of keys, I tend to go all over the range with just a single instrument... that leaves less room for other instruments later on.
I'm not dissing the need for longer keybeds, don't get me wrong... but not everyone needs 5-7 octaves... even if they are live players... there should be "frequency room" for the other players as well.
Let's just hope, that Behringer will do like Yamaha usually does... create different keysizes... then everyone can be happy (as long as they do module versions as well)