On one hand, I'd like to see Skybust succeed (Which they won't...), as ultra LCCs tend to attract the "undesirable" element (i.e., The Greyhound crowd, non FFs, the general riff-raff...) and keep them off of the legacies, which cater towards the business traveller (i.e., Those of us who have to fly whatever the cost...).
On the other hand, I think the bad habits of the LCCs could leach into the legacy carriers. Actually, they already have. Personally, I really don't care about the cost and I don't mind if it goes up to cover expenses, as airfares are actually lower than they were 25 years ago if inflation is taken into consideration. When I have to go somewhere, I really don't even take cost into consideration, I choose by schedule only, and I generally buy last minute full Y tix.
I'm willing to pay for a better experience and amenities such as F and C, FF programs, and lounges. I would just as soon stay in an Econlodge as I would fly a LCC.