They really can't rework Frontlines in a meaningful way because it'll just flood the mode with bots again. That's the main reason it's experience gains were nerfed the first time. There were /way/ too many matches where bots would just sit and feed the other team because even last place provided enough experience to be worth it to the bot runner. I'd love it if it was a worthwhile avenue to gain experience, as it was perhaps my favorite way to level some classes I otherwise despised in PVE, but unless SE finds better ways to discourage the bot players aside from vigilance on the part of the people they queue with it's just not going to happen.

At least this time around Fates are legitimately worth the hassle and provide a decent enough change in pace to be a good break from roulettes from 70-80. Though I honestly wouldn't mind if they took a page from GW2 and gave us a few more 'joke' fates like their Renowned Hearts to further break up the monotony. Where there's more than one way to contribute and not all of them are combat focused, like instead of defeating invading spiders you can clear away their webs instead if you want to, or do both or neither and instead pursue a third or even fourth option. I wouldn't want SE to go ham on something like that and I don't know how well it'd fit but I do remember the Renowned Hearts pretty fondly from my time back in GW2 because they made the leveling grind a bit less soul crushing.

All that said, like Meowing put it though we do have options at the very least. They might not all be enticing but you can rotate between them if one bothers you more than the others on a particular day.