Ask HN: What do you think about SAP?
It's worth a career in SAP?
I would say yes if you have experience developing enterprise applications. And by experience, I mean you've spent the last 5 years doing it for a living. SAP is primarily used by large enterprises, so people hiring for SAP positions probably will not hire self-taught a SAP developer with no on-the-job SAP experience or without experience working with enterprise software.
I, for example, would be screwed. I am 100% self-taught developer (i.e. no degree) with no experience in SAP or developing enterprise applications. While I could pick those things up with relative ease, I'd have nothing to show that I can work with those technologies (and please don't say side-projects)
To sum it up. Have you been involved with enterprise-ish stuff? If so, I'd say try it, if not, I'd stay away from it.
On the other hand, it makes a very boring career, unless you like to dig in business processes and talk to customers, with IT/technology being merely a supporting tool.
If you find your work boring, my advice for you is to look for a different job, because your job won't become more interesting (technology-wise) in the future.
They will hire even a fresh graduate with no experience whatsoever, but I think you misunderstand the landscape around the SAP ERP.
From what I hear, a company that has SAP deployed is not allowed by the contract to develop their own extensions and modules. Instead, they are to hire external consultancy that has SAP's approval. So it's SAP consultancy shops that would or would not hire a programmer to write for SAP ERP. (I may be wrong here, because ERP systems are very far from my field. I just happened to work in the vicinity of an ERP system a decade ago.)
Having that said, two of my friends were hired by such a company. They had no programming experience, they had just finished part-time CS studies (which in my country are tought of as of worse quality than full-time studies), and for both of them the studies were retraining from some other, unrelated field (architecture and HR, respectively). Of course they were tasked with grunt work, exactly as one would expect, but they got into the field of writing for SAP ERP, so it certainly is possible.