I stopped myself from posting about this because I would just be reiterating what most have said, but I will say this.
I am a second year business student, 20 years old. I actually did a group project last semester about opening up an arcade/pool hall. We did research on 12 different establishments similar to our idea, and found that 10 of the 12 didn't survive 18 months. The start up costs for this type of business are very high (more so b/c of the pool tables in my case, but the games aren't cheap either).
We also found through a survey that almost 70% of 20-40 year old male professionals (our largest target group) liked the idea of being able to play pool and especially play older classic games. However, talking to the businesses and owners, we found that very few of these people actually go to the establishments. We found it to be a psychological thing. People who played old games love the idea of a place to play them again, but don't actually use the facility when it's available.
It seems that starting strictly an arcade (as most of our examples were, ie no pool involved) is an uphill battle. Most will fail quickly and owners are left with either a very large amount of debt or with equipment that wind up selling for an obscenely low amount.
If I were in your shoes, I would not risk my money on a venture like this. It is far too risky, and unfortunately has a track record for breaking people. I LOVE the idea... if I could find a way to make it viable business-wise, I'd do it myself, but it seems very likely these days.