Disadvantages to booking next cruise on board?

I was recently on my third SS cruise and booked on board for my fourth one so as to get a 5% booking discount. I wrote on the pay form that I will designate a travel agent within 30 days (am still within 30), as I will be going to New Zealand and Australia and will need TA help figuring out various connections for pre and post cruise issues, and would like a good TA, who I have not found yet but will, to be able to get the cruise commission. But did I make a mistake booking on board? Will this interfere with a TA getting a commission? Are there other disadvantages to on board booking? Cruise is not till feb 2015.

We always book on board and the TA receives the commission. You could also make an open booking and choose which cruise to take at a later date, still receiving the discount.

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Ditto. My TA is always informed by SS when we book on board. He gets his well deserved cut!

Another advantage is that you can have a detailed discussion with the cruise specialist about the available suite choices and locations, if you need to.

My suggestion is to find the TA you want to use (make sure it's one who knows luxury lines) and ask his advice about how best to transfer the booking to him (or her.) It shouldn't be a problem.