I fail to see the problem, the content difficulty will still be tuned in exactly the same manner, just the numbers will be larger and obsolete content will be easier on those turning up late to the party. Power creep is not all bad, you only have to look back at the fun newer players had trying to break into the raiding scene in FFXI during ToAU, you needed Sea access for the majority of active end game shells, but getting the missions done without an active shell to get you through was the stuff of nightmares. Keeping difficulty as is and not inflating player stats would see the same thing happening with T5/Twintania. That's just not the way to run a popular and accessible console mmo anymore.