Unfortunately, loading even a measly 256MB of RAM at today's paces takes 20 minutes or more. Much more....
Until all the manufacturers wake up and dramatically improve data transfer into RAM, big samplers are primarily a home or studio tool, unsuitable to the improvisational needs of an arranger player. And sadly, most modern sample libraries are not as optimized for small RAM requirements as they used to be in the Akai S2000 days, making the problem even worse.
When are we finally going to see RAM data transfer as fast as laptops? Even my 15 year old K2500 design was four times faster than any current arranger sampler....
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An arranger is just a tool. What matters is what you build with it..!