You just made sense of it right there. The fundamentals don't change, true, but the content and representation does. No one's expecting any increase in difficulty for dungeons, as SE has stated they keep them at an accessible level for all players. When I say we'll all be "new", we will officially be leveling again, and prone to the ins and outs of leveling. I can recall many overconfident tanks in ARR raid gear getting wiped in Sohm Al trying to pull too much. Or even the best healers struggling to keep up in the Aery. They weren't bad, they were just new to that content. But by your initial statements, you would dislike them all the same.
It's conjecture at this point, as you clarified your statement, but I'm bringing things around. As for jump potions, I'll worry about that if and when it becomes a reality. Til then, there's plenty of time and opportunity for people to learn their jobs proper (and RELEARN them for the ones that see bigger changes in SB). A certain degree of patience and understanding will be due for your fellow players, who will be experiencing everything and how it works this time. Just like you will.