I don't think you've had a positive experience with altcoins then. Which ones have you invested in?

There are a handful of great projects coming out that I would reccomend checking out to peak your interest. I think the biggest thing they will bring is a solid unit of account rather than a get rich quick scheme. Have you heard of ampleforth before? they have this idea of creating an elastic supply policy that fluctuates in accordance with demand, rather than changing the actual price. maybe somethign that unique is what could change your mind about altcoins.