That doesn't make the solution simple, that makes it impossible. How do you force LN hubs to run a full node? Where do we draw the line between hub and not hub? Do all participants draw that line differently? If you could, as a network, choose not to do business with a node with a large number of channels unless they can also verify it is running on a full node, somehow, what does that do? The hub could divide its channels across several of its own nodes, keeping under the threshold to be considered a "hub". I think this idea is either virtually impossible or useless.