I expect to see a real drop in the crowds as we approach Thanksgiving and especially Christmas. Then you have dead January and February.
Just my personal opinion. They can throw as many billions of dollars at the economic problems we face now, but it won't help anything. People can not buy houses and cars in the USA when their jobs are in India and China. CORPORATE GREED is killing the country. Until they do something to totally stop it, we're doomed. So unless you know you can absolutely get karaoke jobs with your investment, personally I think I would save my money. The big crash hasn't happen yet....
Over the years I have worked in many bars. Tonight my owner told me she is canceling her Wednesday entertainment because the band is making more than she is. (She has had this Jam night for 5-6 years.) Nobody is coming out for it anymore. Don't know if it's band getting boring or the wallets getting smaller. Karaoke has been really good the last 2 weeks at her place. But so far this week the other places have not been too good at all. There are many of these bars sitting on top of the fence and they could fall off, out of existance in a heartbeat. So I think the firmly established karaoke jobs are going to do OK. If I was just starting a karaoke business/new bar night it could be very shaky ground. Bar owners are going to want to see instant results and that just doesn't happen very often. It takes weeks/months sometimes to build a new karaoke night. So they may not have the money or the patience to stick with it to give it enough time to build. Many times the crowds build by one new person a week.

That's just my experience talking but you may have good luck in doing it. It will be a real challenge and if you can't afford to waste the money on something that may or may not do well.... It's nice to have something to fall back on like karaoke. But as I said before you will have to be better than the competition from day one. That is what will get you the best chance for survival. Or really good luck. Or being the cheapest KJ walking. But then again you are doing this to make money. So being cheap will haunt you. Bar owners will never increase your pay when the times get good.
And I don't know how willing they will be to take a chance on a brand new untested unexperienced KJ. Without something of a following.