I agree with your thoughts as well... I just don't know if it's the right time for X to return. At this stage it's almost as if RTD is doing it "just because". Now, if the storyline and so forth is well thought out and well done, sure, that's fine, but even with the whole Sarah Jane thing, although it was nice and well-written, it did seem a bit artificial in a way, like RTD saying, "Hey, let's bring back an old companion!" 🙄 X is such a great character with such a history and such a great story to tell (presumably what with the Time War and all as well) that I don't know if RTD & Co. can honestly do it justice at this point in time.
As I said, it seems artificial to me, but I guess proper judgment won't be able to be formed until we know the circumstances and so forth of his return. I have my concerns though, as this unfortunately seems like one of those "gimmicks", like bringing back Sarah Jane and K-9, having the Daleks and the Cybermen fight, etc. - it just all rings of "Alien versus Predator" such that someone thinks it's what the fans want so they go out of their way, rightly or wrongly, and whether they have a good story or not, to appease the masses (or RTD's childhood fantasies such as "Oooh, I want to bring X back! That would be so cool!")
Don't get me wrong, I ultimately want to see X back as well and think it will be cool, but in this manner and what with the timing, well, as I said I have my concerns. I guess we'll see... 😱