Some light reading on the Embraer 175 reveals that it has an identical thrust to weight ratio as the 195, despite having the baby brother engines. With the slightly smaller wings in the mix, yes it does require a longer take-off run, but not by much.
At MTOW, it is only slightly more than the 195 at just under 2300m. And that'll be with 9t of fuel on board, giving range in excess of 2500km...
Unless I'm missing something, I really don't see that we're going to have any significant issues in the main. All our routes are 1.5 hrs or less on that aircraft, so even with plenty of bums on seats, I don't see it being a significant issue.