> But as far as I know most of Mamedev don't want to do emulation work,if the left work > very difficult or they may be forget why Nicola build Mame.....
Nonsense. The devs who stopped being able to do work have largely formally quit, and the ones that haven't are doing work. Meadows Warp Speed just started running, for instance, although it's strange hardware so it may not be perfect by the next release.