It has been stated that exp rates are likely to increase in pvp. This is good news, but if I may add, what we really could use to improve pvp participation rates, and thus overall enjoyment and growth, would be the ability to join any grand company via duty finder. This can, in my mind, be easily explained in the lore by labeling players outside of their own grand company as "sellswords". It may be a slight stretch from the story intent behind frontlines, but in my opinion would still be a reasonable one. In the story, our characters are aligned with a particular grand company, but are known to all - so it is not unreasonable to imagine a military force may request the aid of established adventurers as a mercenary force.
This could be achieved by enabling the option to toggle if players want to support their specific GC in frontlines (and perhaps grant them a further bonus for doing so), or if they wish to be assigned to a random GC as sellswords without that additional bonus.
This could also allow parties of friends or FCs to queue together, regardless of their chosen GC (something which has long been desired). It is possible that large pre-made parties may need to be sorted separately so they do not overwhelm random players, or balanced to ensure they are pitted against one another - but if overall participation rates are higher, this may be reasonable.
This is something I hope the developers may take under consideration alongside any simple exp increases. Increased participation and enjoyment is the real goal, and I believe a solution such as this would be a large step toward achieving that.
I would very much like to hear opinions on this matter. Apologies as I am sure this issue has been raised in the past, but I am trying to present a reasonable method to accomplish this goal while still retaining the proper lore, which is important but has thus far has been something of a hindrance to widespread pvp participation.