DE, I have a lot of feelings about this. The tl;dr version is: Please reconsider this. I think you're trying to fix the part of this mode that ISN'T broken.
The long version:
There is a joke between me and my (two) friends who play Warframe that I am basically the bullet-jumping shambling corpse of our squad. I go down more in missions than both of the others, combined, because I studied at the Leeroy Jenkins school of gaming and I favor rushing headlong into danger and relying on strength over survivability...
...when I have understanding people around to res my fool ass.
Perma death is literally the entire point of Arbitrations, and I think it's fantastic! Me! The queen of being constantly dead! The ever-looming threat of mortality forces people like me, who generally favor a more "lol oops" method of playing, to actually have to strategize and gear differently and pay closer attention.
And the result of that has been that I have been dying with a little less frequency in other mission types.
Essentially, Arbitrations are forcing me to, as the kids say, 'git gud'. And it's fun!
What you seem to be trying to do here, though, is take Arbitrations and turn them into some sort of weird Index hybrid. If I wanted to do the Index, I'd go do the Index. If I wanted to get res'd, I'd go play any other mission type. I think, rather than making revival possible in Arbitrations, all you really need to do is stop treating death like a mission failure state. Meaning, if the point is to play until you die, then you should do away with extraction and let people play until they die, and then keep whatever resources they've collected along the way, rather than losing them like you would in a mission fail scenario. That way, it would become more of a resource farm in addition to the wave prizes, which I think makes the time between wave prizes less obnoxious. Throw in some new mod drops from the Arbitration drones and you've got yourself a party. (For context, the last time my friends and I ran an Arbitration, we were in a corpus mission, managed to rack up a decent chunk of oxium, and then the last one of us standing had to run to extraction in Operator void mode so we'd all get to KEEP said oxium. It was VERY STRESSFUL.) If someone wants to leave before their death occurs 'naturally,' they can let the enemies overcome them and peace out. [ETA] Or, at the very least, stick with the Index-leaning theme and give players the option of entering "Instant Death mode" or "Burden Revival Mode," like how the Index has different risk tiers.
Is this going to solve the host migration issues? No. But host migration issues are not unique to Arbitrations, and if you're using that as one of your primary reasons for this change, you're not really fixing the root of the problem. I can't begin to tell you the number of times I've gotten booted from ESO due to host migration, either by disconnect or because the efficiency ran out while I was on the loading screen. But I digress.
All I really see you doing here is taking something that was fresh and unique and turning it into a mission just like any other mission, and it's kind of bumming me out.
You mentioned that this change would "shift the mission balance in favor of players" but as is frequently and unfortunately the case, this only shifts it in favor of players in a SQUAD. Anyone who solos Arbitrations is going to suffer from this. Anyone who plays with randos is likely to suffer from this. I understand that the overall attitude of the devs is "Warframe is a multiplayer game so we should always balance toward multiplayer" buuuut maybe, like... don't always do that???
Reading through all the reactions to this post make me wonder why DE doesn't straight-up poll us about changes like this. Propose change. "Does this sound like a good idea? Y/N." Rather than having to rely on someone to (I hope) read through everything and try to tally how many people are in favor and how many are opposed. My overall sense after reading through this thread is that people aren't loving it.
I have a whoooooole separate rant about Riven mods, but I'll save that for another thread. @__@
Thanks to anyone who took the time to read this.