In response to the thread title, I don't think it is necessary to increase interest in hacking. People who want to mod games will do it. They'll see videos and/or pics of modded games, retro or modern, if they find it is something that they want to do, they'll find places like this and board2.
It's no so much the lack of interest in hacking I believe, as it is in time. I myself don't have as much time to do very much anymore. In fact it is very frustrating when your time is very limited.
I used to believe as well that there was a lack of interest in hacking, but having grown up some more and wisen up, that is a false fact. People who don't care about hacking are simply not going to do it, and the people who want to do it, but can't, is because of time. The other factor is that there are people that want to hack, but are not willing to put the effort in to learn (in which case you have to ask yourself, how bad do you want to do it?). And one of the major reasons for lack of time is money. Lack of money means lack of time. Time is money, and money is time.
I believe that if everybody had more money, they'd have more time, and the more hacking would be going on.
But considering the activity that is going on, at this site, and on this forum, I'd say the ROM hacking scene is doing pretty good, and has come a long way.