New Boxer few question!

So me and my wife have decide to give Mulit-boxing a try. Done plenty of research on set-ups but have a few questions to see if we will be able to accomplish our goals.

I will be three boxing:
Prot Pally
Resto Druid
Elemental Shaman

Wife will be two boxing:
MM Hunter
Affliction Warlock

Were still in the leveling process now but hope to start running 85 heroics. Since its still early in the leveling process was hoping to get some feedback on the group and its ability to handle Cata Heroics.

Once we get geared up were also hoping to go back and run old raids.

Can 5 85's handle 40 man raid(BWL, AQ40), 25 man raids from BC and 10 mans from Wrath?
Could we do 10 man wrath heroics?

In the future we plan on moving up to a full 10 man raid with each of us 5 boxing.
What classes should we consider adding and does keeping the raid group varied really help that much?

Finally do you think it will be possible to 10 man Cata content. I was thinking that maybe in future patches 4.2, 4.3 that you could possibly out gear some of the 4.0 raids.

Me and my Wife have no raid experience so please be brutally honest. Thanks for any answers, advice our help that you can share.

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Can 5 85's handle 40 man raid(BWL, AQ40), 25 man raids from BC and 10 mans from Wrath?
Could we do 10 man wrath heroics?

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Id say, that if a wellgeared DK tank can do it atm. I se no problem in you dooing it with a 5 man group. It all comes down to cordination and practice :) (Ok and some gear aswell)

Group looks viable. I personally would re-spec the Lock to Destro - easier to multibox - (less micro management)

You should also look at dual speccing both the Druid and Shaman, so they can do both DPS and healing, then you can pick which one most suits your playstyles.

I find boxing shaman heals to be much easier than boxing druid heals. Chain heal is a boxing godsend!

In a PvE environment, I've had success with Priest, Druid and Shaman heals.
Pally has rocked in PvP, but aside from Holy Radiance, their AoE heals are a bit lacking.

Wild Growth for a Druid is as good as Chain Heal for a Shaman.
I do like that the Shammy has Earth Shield, which combined with Riptide is generally enough healing for most pulls.

Between the two, it is preference really.
I'd probably dual-spec them both, Balance/Resto and Elemental/Resto (as Mikekim suggests), then you can mix and match.
Or run dual DPS, for quests and trivial content, or dual Heals for very challenging content.