Any problems using one Apple ID to span across 6+ devices?

Question

Hi everyone (or at least one person with a kind heart),
I am looking for any guidance for my wife and myself.  Quick background, we are both long time users of the following devices:
A) Her 4s 32 GB iPhone
B) My 4s 32 GB iPhone
C) Her old iPod
D) My Mini 64 GB iPad
E) Her 64GB iPad
F) Our 256GB Macbook Air
F is the newest member of the family.  I originally had a PC Dell which I synced all of the devices to two distinct Windows accounts.
My wife's Windows account & my Windows account.  We have two distinct Apple I.D(s).
Everything synced swimmingly on the old Dell.  Well, the swimming got rough when my old Dell went kablooey!
Fast-forwad a few days and I swallowed my PC pride and jumped ship to a Macbook.  After getting the dreaded "This computer is already associated with an Apple ID" my hunt was on for a solution as I loved my new MacBook.  I did not want to revisit the PC world, again.  Shortly after, I discovered and joined this-thread-already-in-progress .  With no input from Apple, I thought about abandoning the idea and thought - could we (my wife and I) simply merge to one Apple ID, thus resolving the above mentioned warning that "This computer is...blah...blah...blah"? 
Our storage consumption is not that large as we have always tended to have very similar libraries.  We started the Apple ID's so long ago, we just got lazy and always kept it that way. 
Am I not seeing some pitfall that will sour this idea?  Meaning, let's say I pitch my wife's Apple ID?  And we begin to use only my Apple ID?
1) My immediate concern is that I think both of our Apple I.D.'s are at the maximum of the "5 out of 5" number of device warnings due to all of the various Dell, Thinkpads and now Macbook computers I have owned over the years combined with all of the various iPhone, iPod, iPad models we have owned during the same time.
2) Besides simply picking and choosing the various new purchases under our newly merged Apple ID, is there any other sort of problem that I may not be seeing?
3) Is Apple likely to reset the "5 out of 5" ticker due to all of the above?
4) Oh yeah, I have two Apple TVs.  Does that even matter?
Thanks in advance for reading this. 

Answer 1

Razor,  thank you taking the time to help out!  I really mean that.  In digesting your scenario and advice, I think I do have at least one question.  Am I not remembering the "5 out of 5" warning correctly?  You are saying 10 devices but I guess I either read it wrong (very likely) but I thought there was some limit to the number of times you transfer a library of music to a new computer (i.e. not devices)?  I easily could be confused here.  In reading what you wrote again, Apple wants to limit not the computer housing the library but the devices that are sharing the library?  Thus, since I am only at 5 - I am good to go? 
In regards to iTunes Match - we both have it (i.e. my wife and myself).  So, I am covered there?  All I need to do is pick one Apple ID as the "Master ID" (probably my ID), then plug my wife's devices into the MacBook, sync it and then iTunes Match should push-down-from-the-cloud all of her purchases? 
That's interesting about iMessage.  Not sure if I have my mind wrapped around that entirely, but I will re-read your post again.  And in regards to testing my marriage with Apple ID - that rang truer than you could possibly appreciate.  Or maybe not?
I probably have more questions just percolating under the surface - so I will likely holler out to you again until you get bored or annoyed with me.  Something my wife says is a skill I've perfected.
Thanks again!
Glen