Personally I'd like to see the UAV to be higher than it was originally, and is now. I like that the higher end streaks are as high as they are. Hopefully this means the game will focus more on gun on gun play. I felt like I actually did something good in CoD4 if I managed to get a 15+ kill streak. MW2 nukes got boring, harier, ac-chopper wasn't really special.
I'm glad they made the VSAT as high as they did. Blackbird in BO1 was an I win card essentially and 9 kills in BO1 that was nothing. I still hope the VSAT is as good though.
Overall none of this bothers me. The game will come out and people will complain about things being to easy.
I think this was to accommodate the increase in score earned from kills in objective modes (used to be 50, now it's 100 or 75). TDM gets a little screwed over though. RC-XD being increased is good but I don't think they should have lowered the UAV.
Another thing to note is that killstreak kills count towards your streak no matter when they were called in now. If you die and still have a helicopter up, it's kills count towards your streak in the new life. Having said that, don't expect it to help much. Air support kills in tdm/ffa are worth 15-25 points compared to 100 for gun kills.