I'm someone who has read all of that and much more, including intense study of SEP and some contemporary papers and textbooks, and I would say that I am absolutely not qualified to produce philosophy of the quality output by analytic philosophy over the last century. I can understand a lot of it, and yes, this is better than being completely ignorant of the last 2500 years of philosophy as most rationalists seem to be, but doing only what I have done would not sufficiently prepare them to work on the projects that they want to work on. They (and I) do not have the proper training in logic or research methods, let alone the experience that comes from guided research in the field as it is today. What we all lack especially is the epistemological reinforcement that comes from being checked by a community of our peers. I'm not saying it can't be done alone, I'm just saying that what you're suggesting isn't enough and I can tell you because I'm quite beyond that and I know that I cannot produce the quality of work that you'll find in SEP today.