Portal will kill the other game modes.
The response that Portal is getting, I am pretty sure, this game mode will kill the other two. Unless DICE does something drastic.
In a matter of weeks/months, DICE will understand the reasoning behind it's success, as they are usually slow to understand these things. But they will.
And we can expect Portal content to grow.
@EA
Make Hazard Zone Free To Play!
Earn money through skins, cosmetics and your specialists in Hazard Zone.
All Out Warfare can be left as it is, considering players from other games really enjoyed the mode or maybe tweak it to be balanced.
Portal mode requires more content (maps, vehicles, etc) from previous games like BF1 and 2142.
It's the most balanced approach and the one with maximum revenue for you if you're into that :P