I'm going to play nay-sayer, of course....!
I don't want to see ANY of them combine..... Fewer manufacturers mean fewer choices. I approve of them stealing each other's good ideas, though (unless they can patent them!).
Everybody here has a different reason for why THEIR arranger is the best FOR THEM.....
Rather than combine manufacturers, let's combine FEATURES...... here's a quote from a post I wrote a couple of days ago about my perfect arranger
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"Now if I could combine the T2's SA and Mega voices, Break/Fill, and multi pads with the Korg's detailed voice editing and sample import, TC Helion and very contemporary drum samples, with the G70's V-Drums and GrandX piano patch, VK-series B3 sim, OS and layout, and of course the action(!), add in the MS's and Wersi's VSTi ability and sample RAM speed loading, wrap it up in a composite shell to bring the total weight down to about 25lbs, and top it of with a dollop of Chord Sequencer features, well, THEN i probably wouldn't have a thing to post about, I'd be too busy playing!
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What's YOURS......?
The more we talk about these kinds of things, the more likely the industry is going to sit up and take notice.
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An arranger is just a tool. What matters is what you build with it..!