It's already too easy, level 5s for the encounters we have in EA would make it boring.
I mean doesn't that sound like the very thing you'd want to playtest in your Act 1 / skill balance in general? None of the end-of-act fights are "easy", none of them, unless you exploit mechanics like LOS, stealth, surprise and environmental cheese. If you try and do a fight "straight", by having a couple guys at range and a couple in melee, you will get wiped by the encounters I mentioned. That's just true, be honest with yourself, you didn't really beat the spiders the first 3-4 times until you figured out a trick to the fight that will hopefully get patched. Likewise the Gith, Hag, Bullette, etc... There's not a single rollover fight in the back half of the Act unless you are exploiting some part of the mechanics.
