As you are probably aware, it is difficult to generalize how attractive a candidate will on a firm by firm basis. Firms generally hire based on need. If you meet that need and have additional relevant experience, you will probably be more attractive than another candidate that has only the bare minimum of experience. In some firms, having any experience at all is a detractor, because the firm might want to bring in a completely green associate at a lower salary and train them to do things "their way." Other firms view any IP experience as a boone, because it generally signifies that the candidate will require less training than a completely green associate.
In my opinion, a combination of business law and IP experience can be very powerful, especially on the in-house side of the game. I left a very large IP boutique roughly 1 year ago to become the sole in house IP counsel of an engineering firm, and I quickly realized that my job was ~80% business, 20% IP. given that distribution of work, andf if I am honest with myself, I have to say that my company might have been better off hiring a corporate attorney who has some IP transactional experience, as opposed to hiring me (a "pure" IP attorney with substantial patent experience, but little to no business experience).
Personally, I think it will all come down to how you spin yourself to an IP firm in the future, and what that firm's needs are. If you are a business centric attorney and haven't done much recent prosecution, you will be less attractive to firms looking for a "pure" prosecution specialist. On the other hand, you would be a very strong candidate if the firm you apply with is looking for someone who has substantial corporate transaction experience.