I have mixed feelings about changing the unlock system...
On the one side having this many weapons and characters available to unlock from day one is pretty cool, i mean if you get lucky with an SP or PSP, i don't think you'd complain.
However, on the other hand, you're much less likely to get something decent because the amount of stuff from that pile of rares and ultra-rares that are actually worth using, is
pitifully small.
I've spent
too many hours on this game already and i still need to max out a substantial number of items, i've had more than my fair share of crappy packs but that's just the way the system is

Would i welcome a change in the system? Yes, of course. Do i think there will be a change? Nope.
They might introduce more packs or perhaps increase the content of some but my dreams of seeing some of the weapons/mods/characters/equipment downgraded to a different rarity status are very unlikely to occur.
Of course there will always be some people who have played since day one and now have maxed manifests, that will say something like "it's not fair, we had to work for our stuff". While there is some truth in that, you can't deny that the situation has changed since then and having this much stuff to unlock now is, to say the least, daunting.