If you do move from technical to functional, one key criteria is: will I get the project exposure to make my new skills stick? In your case, it looks like your company is going to give you that all-important first project experience on the SD side.
Now, I don't know what version of SAP your company is running on, and that's become very important at this juncture. For example, if you're running on the latest (ECC 6.0/mySAP ERP 2005), I would definitely recommend you making the move to SD as you will be part of the second wave of consultants to get that 6.0 experience, running well ahead of the pack. Even 5.0 SD exposure would be pretty appealing. On the other hand, if your company is still running on 4.6, then that's a tougher call. As a 4.6 SD professional, you will be competing for openings with more senior SD people, all of whom have deep experience in that particular release. Also, Basis skills are not all the same either. The more current your Basis skills are, the better your chances are on the Basis side. Also, the types of technical tools that you have experience in impacts your marketability. Standard system admin is a lot less compelling than web-based EAI skills or BW security experience.
We also have to take into account your own greatest interests. I find that when consultants worry too much about which area is most marketable, they can lose track of where their own interests lie. In the long run, that may be more important. When you think about it, the most important key to marketability is becoming an expert. Aren't you more likely to become an expert in an area you have a real passion for? Passionate dedication leads to expertise, so if you are passionate about a particular area of SAP, don't jump ship too quickly - often with some skills updating you can add some sizzle to seemingly "out of fashion" skill sets - and that includes ABAP and Basis.
The bottom line is that SD should be more marketable than Basis in five years' time, but as I noted, there are many other aspects to consider.
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