look at the atari flashback for example
a lot of people in our circles thought the idea and concept were great, but the execution sucked. enter the flashback 2, and things are looking much much better. it is still not perfect, but without actual out-of-date hardware that cannot be economically feasible.
this arcade cab is a good first step, i wont be buying one, but if the company that produces them (or another company that follows the progress of this unit) finds way to improve this without adding much cost, i will be willing to buy
it acutally surprises me that more IP holders havent embraced MAME, and licensed it to produce more of these types of devices.