Does any one believe if arranger manufacturers took a traditional arranger and loaded it with “modern sounds” and “modern styles” you would be able to play classic pop, r&b, and hip hop songs made in the past 15 years?

The style operation of a traditional arranger is not conducive to today’s music.

If arranger manufacturers were to try to make such styles they would end up making song specific styles (which defeats the purpose of an arranger). Any thing song specific, would be best dealt with as a midi or audio file and the keyboard would have to have markers and great navigation within that file.

If you think of an arranger strictly as it relates to content (which it seems most persons on SZ do,) then yes arrangers would become none existent in the near future.
But, if you think of an arranger as a live performance and creation tool, then you would see that the arranger popularity is just beginning.