If we get ten more years of final fantasy xiv expansions...

[dspguy]

I'd like XIV to enter a FFXI "75 era" of horizontal expansion.

Part of the reason horizontal expansion worked in FFXI is that there were very few (if any) pre-requisites to enter the new expansion zones and access all their content. It was commonly just purchasing the expansion and getting to some original release zone. You could work on the "MSQ" of any expansion at the same time. Whereas in FFXIV, it is a linear progression from ARR through EW.