Yes it does depend on your style of music.
Generally speaking in a typical arrangement in Cubase or Logic I run probably around 40 tracks and upwards - very techy, loads of layered percussion with lots of tricks and effects. It sounds a lot but density of sound is important to my style - it's not something I can simplify too much for going live either as my stuff is very well known - I'm up to my 50th release, possibly more.
That's why in order to make my sound translate to Live I need to make lots of loops containing more than one element and build it that way. I would say that running more than 8 tracks in a Live situation with the number of changes I need to make would be nigh on impossible to do by myself.
I can DJ on three decks pretty easily, four I find almost impossible - there's just too much going on to be able to keep track of it. In an 8 track Live setup I'm effectively going to be DJing with 8 'decks' +FX but without having to worry about beat matching, making mashups of my own stuff on the fly.
I'm using a keyboard for triggering clips and the UC33 for mixing and controlling FX so the midi translator idea sounds good - when I press C1 to trigger a clip on track one it can also be mapped to a stop clip on track 2 and vice versa - it would then operate exactly the same as if I'd gone '1 down' instead of across (1 and 2 will have exactly the same UC33 controllers mapped to them).
I'm not too intent on triggering scenes one by one and having things play together in a pre-programmed manner as I can't see the point, I may as well just play the records in that case, so they don't need to be laid out in that way, although if after experimentation it looks like it will be too much of a handfull to do it there will be some pre done scenes.