The problem isn't supers, the problem is these alliances' sheer numbers (which I genuinely admire and respect them for, when they're not setting up house in my backyard). Lowsec isn't made for that, and it generally avoids it by not being worth their effort for most things (moons being a notable exception, staging proximity to other areas of null being another).
You're suggesting that low should be buffed specifically to attract more interest from null, but it makes no sense to artificially draw null dwellers into low, when high is full of people making substantially more than a lowsec dweller can make outside of FW.
Personally, I like low exactly the way it is and I don't know why people keep talking about "fixing" it. If you don't think enough people live there, move there yourself.