The problem is that ROM memory of the arrangers are still sooo far away from the serious VSTi that the audio loops might be an easier solution for now.

But I rather agree with what Diki said. The whole point of using MIDI signal chain is to be able to adjust, modify and tweak after your heart desire. With AUDIO you gain realism (for this stage cannot be beaten) but all those possibilities of changing are gone. Some will preffer this, as they don't care much for tweaks, but it's a shame to loose that.

The HiQ drum VTSi are the prove that realistic sample is possible and a better way.

IMO, even a partnership of let's say Roland with let's say SWW for Drum Core will improve every aspect of drumming in an arranger, while avoiding re-invent the wheel with all the R%D investments. But this is merely an example, Roland is actually doing very well with drums in BK9 I believe.

So, I'd vote for large samples and larger memory and flexibility.