Do you suppose routing fees might increase as larger hubs come into existence?
Definitely.
The LN is still being tested currently. Once it is fully released and people start using it, there will be routing fees.
Currently it is more like testing how payments in the future will look like
My reasoning is that those who have larger funded channels will be able to service more users, which will lead to them being able to dictate higher routing fees for the sake of convenience (so users don't have to create new channels for larger sums, for instance).
User can at any time decide to open a new channel with any person.
You do not have to open a direct channel to the person you want to pay or receive from. There just has to exist a route between you and your target (through multiple hops).