I must reluctantly agree with DNJ. Most people have no idea whether you are playing "live", using midi files, MP3s, DVDs or STDs. And they don't care as long as it sounds good.
They can see you singing though.
I have tried to find younger people, including my own kids, interested in learning to use arrangers. No luck.
The music stores here quit carrying them, except for the little bitty ones, a Casio or two, and piano/arranger combos such as Clavinovas.
I believe the future of arrangers is limited unless the manufacturers start promoting them to younger people. Not sure how they would accomplish that, short of getting a well-know performer to admit using them.
I recall Techics running ads showing stars, such as Johnny Cash, using them.
Of course they went out of business!
DonM