CompostCORNER has spoken plenty and made much um sense but what we don't have is any firm rules on what machines we CAN emulate (if any) without pizzing off the manufacturers. I mean - what is dead technology? All the arcades round here (Great Yarmo) have plenty of Eachway Shuffles, Exchanges Unlimited etc etc .... machines from the 1980s.
Look at it from the point of view of a manufacturer. If everyone learns these machines and they don't look like a good prospect from the owners point of view, they will more than likely purchase new machines to replace them, this can only be seen as a plug from the point of view of the manufacturer. From the arcades point of view, a number of punters go in with the misconcieved idea that they have an advantage over the machine because of the emulator, and old 'dead technology' machines will once again recieve interest, and therefore profit. Not only does it help manufacturers & arcades, but it does to a certain extent help the rose tinted spectacle wearing geriatrics who dream of the days where the most you could lose on a bandit in the space of an hour is a quid, and a jackpot was the equivalent to a deposit on a mortgage.
No-one loses out at the moment, however if newer machines were emulated, arcades would be reluctant to purchase them in case of player advantage, therefore manufacturers would not be happy, the machines sited at arcades would all be obsolete within weeks, therefore the arcades would be in bad stead, and the whole industry could collapse. I doubt it would due to the very fickle (and cruel addictive nature) of fruit machines, not to mention it would overall increase revenue on machines that were constantly being played due to the aforementioned misconcieved player advantage.
To be precise though, it's very unlikely that release current techs would have a positive impact, asides from that of the possible collapse of the industry.