I don't expect the fees to rise significantly.  After some initial mega-jams, things should settle down with the average traffic somewhat below the capacity (say, 2.6 tx/s, as in my example).   In that state,  the minimum fee will usually provide confirmation within a day, and confirmation in less than 1 hour will usually be achieved with relatively modest fees.   The traffic will not increase further because of the unpredictable delays, which will occur even if everybody ends up paying 100 $/tx of fees.