With your experience in so many application areas, I doubt that so much theory oriented learning would be of much benefit. You are more likely to be hired for

With your experience in so many application areas, I doubt that so much theory oriented learning would be of much benefit. You are more likely to be hired for your domain knowledge. Based on your plan, you would become better versed in several areas of theory, but still limited to being a Java programmer - which in turn will probably lock you into the enterprise space. Unlikely to give you real problem solving opportunities. @grobaru hit the nail on the head. The established firms you list are either going to hire you for your general programming knowledge or for a specific project. In the latter case domain knowledge and experience is going to be valuable. I think you need to revisit your goals. What industries do you prefer to work in? What domain knowledge do you bring to the table? Look at what languages, frameworks are used in those areas and then get some experience with them. And have you considered startups? Their mission and problem domain(s) tends to be more focused than the big companies.