No one is requesting to eliminate the LINEAR format in Cubase, but rather offer the option/functionality of using it as a PATTERN-BASED sequencer when that type of writing/arranging is needed.
This is so useful for electronic/beat type composing, and many other genres of music, to facilitate experimenting in a speedy manner with smaller section of musical ideas, and arrange the blocks in a lego fashion, change them in many ways, this is a lot of fun, and does stimulate creativity in building unique musical structures, by experimentation, and trying out how various musical patterns/motifs/ideas sound linked to each other in various combinations, and repetitions, a lot of un-expected, surprises can surface, that you might have not considered if you were restricted to a LINEAR (ONLY) style DAW.
I feel that modern DAWs need this type of feature which imho is a no brainer. The strictly LINEAR DAW is fine, but limits the way some of us like to work, experiment, and build our arrangements.
Hopefully Steinberg will deliver something of this nature in Cubase 7, that goes beyond the ‘ARRANGER TRACK’, by taking it to the next level up 
Cheers,
Muziksculp