I edited my error, you were right there, but not about Deathstreaks being in ALL games to come. I could easily as confidently say they will not be in Black Ops II, plus I can back it up with reasoning - even if it is speculative.
1. Treyarch have never made a game with Deathstreaks.
2. Black Ops did not have Deathstreaks and Black Ops II is a sequel.
3. Treyarch resisted continuing Deathstreaks from IW's MW2 because they did not feel they were right.
4. The backlash from the community after MW2 should've prevented them ever being in MW3.
5. The backlash from MW3 not just having them but going right against the community is something Treyarch are proud of NOT doing. They like to listen.
6. Deathstreaks are anti-COD and illogical.
7. There are way better ways to help out player performing poorly and Treyarch like to be innovative - Combat Training and Boot Camp are options.
8. Deathstreaks do not improve a player's skill or enjoyment of the core game, just the score and limited revenge satisfaction.
9. Deathstreaks is an anagram of Dearth Steaks, Dearth Stakes, Darth Eats Eks and Darth Takes E's, none of which can be good.
The only thing multiple deaths in-a-row should encourage is delayed spawns to prevent boosting and wildly wreckless play.